# Point-of-Care Antigen Tests in Veterinary Medicine ## Quick Answer - Point-of-care antigen tests provide rapid in-clinic results for conditions such as feline leukemia virus and heartworm, but positive results require confirmation before treatment decisions. - Use a structured decision pathway that pairs POC antigen screening with laboratory PCR or other confirmatory testing when clinical signs or patient history create uncertainty. - Test performance varies by manufacturer, storage conditions, and disease prevalence, so negative results do not exclude infection during early disease stages. ## Understanding Point-of-Care Antigen Tests in Veterinary Practice Point-of-care antigen tests detect specific proteins or glycoproteins from infectious agents directly in patient samples such as whole blood, serum, plasma, or feces. These immunoassays use lateral flow or similar technologies to produce visible results within minutes, allowing veterinarians to make immediate management decisions during an office visit. The American Veterinary Medical Association emphasizes that regular veterinary visits support early disease detection and preventive care, and POC antigen tests serve as one component of that diagnostic process. The clinical value of these tests lies in their speed and simplicity. A veterinarian can run a feline leukemia virus antigen test while the owner waits, discuss the result immediately, and recommend next steps without delaying care. This immediacy matters for conditions where early intervention changes outcomes, such as heartworm infection in dogs or FeLV in cats. However, the speed of POC testing carries tradeoffs. Antigen tests are designed to detect a specific target, and their sensitivity and specificity vary between manufacturers and between different diseases. Sensitivity refers to the ability of a test to correctly identify animals that are truly infected. Specificity refers to the ability to correctly identify animals that are not infected. A test with high sensitivity produces few false negatives, while a test with high specificity produces few false positives. For the practicing veterinarian, the practical question is not whether POC antigen tests are useful, but when they can be trusted and when they require confirmation. The answer depends on the disease being tested, the clinical context, the prevalence of the disease in the local population, and the consequences of a wrong result. ## Core Principles of Antigen Detection Antigen tests differ fundamentally from antibody tests. Antibody tests detect the immune response of the animal to an infection, which takes time to develop and persists after recovery. Antigen tests detect the infectious agent itself, meaning a positive result indicates the presence of the organism or its proteins at the time of testing. This distinction matters for clinical interpretation. An antibody test can remain positive long after an animal has cleared an infection, while an antigen test becomes negative once the agent is eliminated. Conversely, an antigen test can be negative during the early stages of infection when the antigen concentration has not yet reached the detection threshold of the test. The detection threshold is a critical concept. Every antigen test has a limit of detection, which is the minimum concentration of antigen that produces a positive result. Animals with antigen levels below this threshold will test negative even though they are infected. This situation is called a false negative result. The window period is the time between infection and the point when antigen levels become detectable. During this period, an infected animal can transmit disease to others while testing negative. For heartworm disease, the window period is particularly important because immature heartworms do not produce detectable antigen until they mature, which takes several months after infection. The World Small Animal Veterinary Association provides global clinical guidelines that address diagnostic approaches and preventive care. These guidelines emphasize that diagnostic decisions should be based on the best available evidence and that clinicians should understand the performance characteristics of the tests they use. ## At a Glance The following table summarizes the key considerations for using point-of-care antigen tests in common veterinary scenarios. | Disease | Sample Type | Key Clinical Question | Confirmatory Approach | | --- | --- | --- | --- | | Feline leukemia virus | Blood, serum, plasma | Is the cat actively infected and shedding virus? | PCR or repeat antigen testing after a defined interval | | Heartworm | Blood, serum, or plasma | Is the dog infected with adult heartworms? | Confirm with a different test method or laboratory testing | | Feline heartworm | Blood, serum, or plasma | Is the cat infected with heartworms? | Combine with antibody testing and imaging | | Canine parvovirus | Feces | Does the dog have active parvovirus infection? | PCR testing when clinical signs are strong but antigen test is negative | The table shows that no single POC antigen test provides a complete diagnostic answer. Each test requires a confirmatory strategy that depends on the disease and the clinical situation. ## Clinical Workflow for POC Antigen Testing The decision to use a POC antigen test should follow a structured workflow that considers the clinical question, the test characteristics, and the consequences of the result. ### Step 1: Define the Clinical Question Before running any test, the veterinarian must define what question the test is intended to answer. For heartworm, the question is whether the dog has adult heartworms. For FeLV, the question is whether the cat is infected and likely to become persistently infected. For parvovirus, the question is whether the dog has an active infection that requires isolation and treatment. The clinical question determines which test to use and how to interpret the result. A test that is appropriate for screening a healthy dog for heartworm may not be appropriate for confirming a diagnosis in a dog with clinical signs. ### Step 2: Select the Appropriate Test The veterinarian should select a test that has been validated for the species and the disease in question. Tests are not interchangeable across species. A heartworm test designed for dogs may not perform the same in cats, and a FeLV test designed for cats may not perform the same in other species. The test should also be appropriate for the sample type. Some tests are designed for whole blood, while others require serum or plasma. Using the wrong sample type can produce invalid results. ### Step 3: Perform the Test According to the Manufacturer Instructions Each test has specific instructions for sample collection, storage, and processing. The veterinarian should follow these instructions exactly. Deviations can produce false results. The test should be performed at the correct temperature and within the correct time frame. Some tests require the sample to be processed within a certain period after collection. Others require the test to be read at a specific time after the sample is added. ### Step 4: Interpret the Result in the Clinical Context A positive antigen test result does not always mean the animal is infected. A negative result does not always mean the animal is free of infection. The veterinarian must interpret the result in the context of the clinical signs, the history, and the prevalence of the disease in the local population. ### Step 5: Confirm When Necessary When the result is inconsistent with the clinical picture, or when the consequence of a wrong result is severe, the veterinarian should confirm the result with a different test. This confirmation can be a different POC test, a laboratory test, or a test that detects a different aspect of the infection. ## Validation and Quality Control The reliability of a POC antigen test depends on the quality of the test itself and the quality of the testing process. The veterinarian should use tests that have been validated by the manufacturer and that have demonstrated acceptable sensitivity and specificity in published studies. ### Manufacturer Validation The manufacturer should provide data on the sensitivity and specificity of the test, the limit of detection, and the cross-reactivity with other agents. The veterinarian should review this information before adopting a new test. ### In-Clinic Quality Control The clinic should have a quality control program that includes the use of positive and negative controls. These controls verify that the test is working correctly and that the results are reliable. The clinic should also maintain records of test results and quality control results. These records allow the clinic to monitor the performance of the test over time and to identify problems. ### Storage and Handling The test kits should be stored according to the manufacturer instructions. Exposure to heat, moisture, or light can degrade the test components and produce false results. The clinic should monitor the storage conditions and the expiration dates of the test kits. ## Common Failure Patterns in POC Antigen Testing Several common failure patterns can produce incorrect results in POC antigen testing. Understanding these patterns helps the veterinarian avoid them and interpret results correctly. ### False Negative Results False negative results occur when the test fails to detect an infection that is present. The most common cause is testing during the window period when antigen levels are below the detection threshold. For heartworm, this window can last several weeks after infection. For FeLV, the window is shorter but still exists. False negatives can also occur when the test is performed incorrectly. Using the wrong sample type, not following the instructions, or reading the test at the wrong time can all produce false negatives. ### False Positive Results False positive results occur when the test indicates an infection that is not present. This can happen when the test cross-reacts with other antigens or when the test is read incorrectly. A faint line on a lateral flow test can be misinterpreted as a positive result. False positives are particularly problematic for diseases with serious consequences, such as FeLV. A false positive FeLV result can lead to unnecessary treatment, isolation, or even euthanasia. ### Invalid Results Invalid results occur when the test fails to produce a valid result. This can happen when the test is expired, stored incorrectly, or performed incorrectly. The test should be repeated with a new test kit. ### Interpretation Errors Interpretation errors occur when the veterinarian misinterprets a valid test result. This can happen when the veterinarian does not consider the clinical context or the prevalence of the disease in the local population. ## Heartworm Testing Heartworm disease is caused by the parasite Dirofilaria immitis, which is transmitted by mosquitoes. The disease affects dogs and cats, and the clinical signs can be severe. ### The Antigen Test for Heartworm The POC antigen test for heartworm detects the presence of adult female heartworm antigens in the blood. The test is most accurate in dogs that have been infected for at least six months, when the adult worms have matured and are producing detectable levels of antigen. The test is less accurate in cats, which often have low worm burdens and produce lower levels of antigen. The test can be negative in cats that are infected, so a negative result does not rule out heartworm disease in cats. ### Clinical Use of the Heartworm Antigen Test The heartworm antigen test is used for routine screening in dogs, particularly in areas where heartworm is common. The test is also used to confirm a diagnosis in dogs with clinical signs of heartworm disease. The test should be used in combination with a heartworm antibody test in cats. The antibody test indicates exposure to heartworm, while the antigen test indicates the presence of adult worms. ### Confirmatory Testing for Heartworm When the antigen test is positive, the veterinarian should confirm the result with a different test. The confirmatory test can be a laboratory test that uses a different method, or it can be a test that detects a different antigen. The veterinarian should also consider the clinical context. A positive antigen test in a dog with clinical signs of heartworm disease is more likely to be a true positive than a positive test in a healthy dog. ## Feline Leukemia Virus Testing ### The Antigen Test for FeLV The POC antigen test for FeLV detects the presence of the p27 antigen, which is a protein produced by the virus. The test is used to screen cats for FeLV infection and to confirm a diagnosis in cats with clinical signs. The test is sensitive and specific, but it can produce false results. The test can be negative in the early stages of infection, when the virus has not yet produced enough antigen to be detected. The test can also be positive in cats that have a transient infection, which is an infection that resolves on its own. ### Clinical Use of the FeLV Antigen Test The FeLV antigen test is used for routine screening of cats, particularly in multi-cat households and in shelters. The test is also used to confirm a diagnosis in cats with clinical signs of FeLV infection. The test is used in combination with a clinical examination and a history. A positive test result in a cat with clinical signs of FeLV infection is more likely to be a true positive than a positive test in a healthy cat. ### Confirmatory Testing for FeLV When the antigen test is positive, the veterinarian should confirm the result with a different test. The confirmatory test can be a laboratory test that uses a different method, such as an immunofluorescence assay or a PCR test. The confirmatory test is important because a false positive FeLV result can lead to unnecessary treatment or a decision to euthanize a cat that is not infected. ## Parvovirus Testing ### The Antigen for Parvovirus The POC antigen test for parvovirus detects the presence of the virus in the feces of an infected dog. The test is used to diagnose parvovirus infection in dogs with clinical signs such as vomiting, diarrhea, and lethargy. The test is sensitive and specific, but it can produce false negatives. The test can be negative in the early stages of infection, when the virus has not yet been shed in the feces. The test can also be negative in dogs that have been vaccinated, because the vaccine can interfere with the test. ### Clinical Use of the Parvovirus Antigen Test The parvovirus antigen test is used for the diagnosis of parvovirus infection in dogs with clinical signs. The test is also used for the screening of dogs in shelters, where parvovirus can spread quickly. The test is used in combination with a clinical examination and a history. A positive test result in a dog with clinical signs of parvovirus is strong. A negative test result in a dog with clinical signs does not rule out parvovirus, and the veterinarian should consider a confirmatory test. ### Confirmatory Testing for Parvovirus When the antigen test is negative but the clinical signs are strong, the veterinarian should confirm the result with a laboratory test. The confirmatory test can be a PCR test, which detects the virus in the feces. The confirmatory test is important because a false negative parvovirus result can lead to a delay in treatment and the spread of the virus to other dogs. ## Clinical Decision Making The decision to use a POC antigen test should be based on the clinical context and the consequences of the result. The veterinarian should consider the following factors: ### The Prevalence of the Disease The prevalence of the disease in the local population affects the predictive value of the test. A positive test result is more likely to be a true positive in a population with a high prevalence of the disease. A positive test result is more likely to be a false positive in a population with a low prevalence of the disease. ### The Consequences of a Wrong Result The consequences of a wrong result should be considered. A false positive result can lead to unnecessary treatment, isolation, or a decision to euthanize an animal. A false negative result can lead to a delay in treatment and the spread of the disease. ### The Clinical Signs The clinical signs of the animal should be considered. A positive test result in an animal with clinical signs of the disease is more likely to be a true positive than a positive test in a healthy animal. ### The History of the Animal The history of the animal should be considered. An animal that has been exposed to the disease is more likely to be infected. An animal that has been vaccinated may have a false positive result. ## Confirmatory Testing Strategies The confirmatory testing strategy depends on the disease and the clinical context. The following strategies are commonly used: ### Repeat Testing Repeat testing is the simplest confirmatory strategy. The veterinarian repeats the test after a defined interval. If the result is positive on the repeat test, the result is more likely to be a true positive. Repeat testing is useful for FeLV, where a transient infection can produce a positive result that is not persistent. A repeat test after a few weeks can confirm the result. ### Laboratory Testing Laboratory testing is the most reliable confirmatory strategy. The veterinarian sends the sample to a laboratory for a test that uses a different method. The laboratory test can be a PCR test, which detects the virus itself, or a test that detects a different antigen. Laboratory testing is useful for heartworm, where the confirmatory test can be a different antigen test. Laboratory testing is also useful for parvovirus, where the confirmatory test can be a PCR test. ### Clinical Confirmation Clinical confirmation is the use of the clinical signs and the history to confirm the result. The veterinarian considers the clinical context of the result. A positive test result in an animal with clinical signs of the disease is more likely to be a true positive. Clinical confirmation is useful for parvovirus, where the clinical signs are strong and the test result is often positive. ## Limitations of POC Antigen Testing POC antigen testing has several limitations that the veterinarian should consider. ### Sensitivity and Specificity The sensitivity and specificity of the test are not perfect. The test can produce false negatives and false positives. The veterinarian should consider the sensitivity and specificity of the test when interpreting the result. ### Window Period The window period is the period between infection and the time when the antigen is detectable. The window period varies with the disease and the test. The veterinarian should consider the window period when interpreting a negative result. ### Cross-Reactivity The test can cross-react with other antigens. The cross-reactivity can produce a false positive result. The veterinarian should consider the cross-reactivity of the test when interpreting a positive result. ### Sample Quality The quality of the sample can affect the result. The sample should be collected and stored correctly. The sample should be tested within the correct time frame. ### Test Quality The quality of the test can affect the result. The test should be stored correctly and used before the expiration date. The test should be performed correctly. ## Welfare and Safety Context The use of POC antigen tests has welfare and safety implications for the animal and the veterinarian. ### Animal Welfare The test can be used to detect a disease that is not yet clinical. The early detection can lead to early treatment and a better outcome for the animal. The test can also be used to prevent the spread of the disease to other animals. The test can also be used to make a decision about the animal. A positive test result can lead to a decision to treat the animal. A negative test result can lead to a decision to not treat the animal. ### Safety The test can be used to prevent the spread of a disease to other animals. The test can be used to identify animals that are infected and to isolate them from other animals. The test can also be used to prevent the spread of a disease to humans. The test can be used to identify animals that are infected with a zoonotic disease. ### The Role of the Veterinarian The veterinarian has a role in the use of POC antigen tests. The veterinarian should be aware of the limitations of the test and the clinical context. The veterinarian should be able to interpret the result and to make a decision. The veterinarian should also be able to communicate the result to the owner. The veterinarian should be able to explain the result and the implications of the result. ## Professional Escalation Criteria The veterinarian should escalate the case to a specialist when the clinical situation is complex or when the result is uncertain. ### When to Escalate The veterinarian should escalate the case when: - The clinical signs are severe or the animal is unstable. - The test result is inconsistent with the clinical signs. - The test result is positive but the clinical signs are not consistent. - The test result is negative but the clinical signs are strong. - The animal has a history of exposure to the disease. - The animal is a breeding animal or a valuable animal. ### How to Escalate The veterinarian should escalate the case by referring the animal to a specialist. The specialist can be a veterinary internist, a veterinary cardiologist, or a veterinary oncologist. The veterinarian should provide the specialist with the test result and the clinical history. The specialist can then perform the confirmatory test and make a diagnosis. ## Common Failure Patterns in Clinical Practice The following failure patterns are common in clinical practice: ### Failure to Confirm a Positive Result The veterinarian may fail to confirm a positive result. This can lead to a false positive result and a decision to treat an animal that is not infected. ### Failure to Consider the Window Period The veterinarian may fail to consider the window period. This can lead to a false negative result and a delay in treatment. ### Failure to Consider the Prevalence The veterinarian may fail to consider the prevalence of the disease. This can lead to a false positive result in a low-prevalence population. ### Failure to Consider the Clinical Signs The veterinarian may fail to consider the clinical signs. This can lead to a false positive result in a healthy animal. ### Failure to Use the Correct Sample The veterinarian may fail to use the correct sample. This can lead to an invalid result. ## The Role of the Veterinary Team The veterinary team has a role in the use of POC antigen tests. The team should be trained in the use of the test and the interpretation of the result. ### The Role of the Veterinarian The veterinarian is responsible for the interpretation of the result and the decision to treat. The veterinarian should be aware of the limitations of the test and the clinical context. ### The Role of the Veterinary Technician The veterinary technician is responsible for the performance of the test. The technician should be trained in the use of the test and the performance of the test. ### The Role of the Veterinary Assistant The veterinary assistant is responsible for the collection of the sample and the handling of the sample. The assistant should be trained in the collection of the sample and the handling of the sample. ## The Future of POC Antigen Testing The future of POC antigen testing is likely to include new tests and new technologies. The new tests are likely to be more sensitive and more specific. The new tests are likely to be more convenient and more affordable. The new tests are likely to be used for a wider range of diseases. The new tests are likely to be used for the detection of new diseases. The new tests are likely to be used in the field and in the clinic. The new tests are likely to be used for the detection of diseases in animals and in humans. ## A Practical Record System for POC Antigen Test Interpretation The clinical value of a point-of-care antigen test depends on more than the test result itself. A structured record system that tracks test performance, patient history, and confirmatory outcomes allows a practice to measure its own diagnostic accuracy and to identify patterns that would otherwise remain invisible. Without such a system, a veterinarian may repeat the same interpretive error for years without recognizing it. The American Animal Hospital Association emphasizes that practice teams should use consistent protocols and documentation to support preventive care and diagnostic decisions. A record system turns individual test results into practice-level evidence. ### The Test Event Record Every POC antigen test performed in the clinic should generate a single record that captures the conditions of the test and the clinical context. This record is not a laboratory report. It is an operational document that allows the veterinarian to reconstruct the circumstances of each result. The record should include the patient identification, the date and time of the test, the specific test kit and lot number, the sample type, the person who performed the test, and the result as read. The record should also include the clinical question that prompted the test, the patient history, and the clinical signs present at the time of testing. The lot number is a critical field. Test kits from the same manufacturer can vary between production lots. If a clinic identifies an unexpected pattern of false positives or false negatives, the lot number allows the clinic to determine whether the problem is isolated to a specific batch. The manufacturer should be notified when a lot is suspected of producing unreliable results. The World Organisation for Animal Health emphasizes that diagnostic quality depends on the traceability of test materials and the ability to investigate unexpected results. The person who performed the test should be recorded because operator technique is a common source of error. A technician who consistently reads tests at the wrong time or uses the wrong sample volume will produce a pattern of errors that is visible in the records. The record allows the practice manager to identify the need for retraining. ### The Patient-Level Test History Individual test events should be linked to a patient-level history. This history is the longitudinal record of all POC antigen tests performed on a single animal, along with the confirmatory results and the clinical outcome. The patient-level history is the only way to determine whether a positive result was a true positive or a false positive. A positive FeLV antigen test that is later confirmed by PCR is a true positive. A positive FeLV antigen test that is followed by a negative PCR and a negative repeat antigen test is a false positive. Without the patient-level history, the veterinarian cannot know which of these situations occurred. The patient-level history should also record the clinical outcome. An animal that tests positive for heartworm antigen and then develops clinical signs of heartworm disease provides evidence that the test result was correct. An animal that tests positive for heartworm antigen and remains clinically normal for years, with no evidence of infection on imaging, provides evidence that the test result was incorrect. The clinical outcome is the final arbiter of test accuracy. ### The Practice-Level Summary The practice-level summary is an aggregate of all patient-level results over a defined period, such as a quarter or a year. The summary should include the total number of tests performed for each disease, the number of positive results, the number of negative results, the number of confirmatory tests performed, and the number of confirmed true positives and true negatives. This summary allows the practice to calculate its own positive predictive value and negative predictive value for each test in its own patient population. The practice-level summary is particularly useful for understanding the effect of disease prevalence. The predictive value of a test depends on the prevalence of the disease in the population being tested. A positive heartworm antigen test in a region where heartworm is rare is more likely to be a false positive than a positive test in a region where heartworm is common. The practice-level summary allows the veterinarian to estimate the local prevalence and to adjust the interpretation of test results accordingly. The Merck Veterinary Manual notes that the predictive value of a diagnostic test depends on the prevalence of the disease in the population, and that clinicians should consider this relationship when interpreting results. The practice-level summary should also track the rate of invalid results. A high rate of invalid results indicates a problem with test storage, test handling, or test performance. The rate should be monitored over time. A sudden increase in invalid results may indicate a problem with a specific lot or a change in the storage conditions. ### The Confirmatory Testing Log The confirmatory testing log records the outcome of every confirmatory test performed in the practice. The log should include the initial POC result, the confirmatory test method, the confirmatory test result, and the final diagnosis. The log should also record the time between the initial test and the confirmatory test. This time interval is important because the disease status of the animal can change over time. A cat that tests positive for FeLV antigen and then tests negative on a confirmatory test performed months later may have cleared a transient infection instead of having had a false positive initial test. The confirmatory testing log is the basis for the practice-level summary. Without the log, the practice cannot determine the true positive rate or the false positive rate. The log should be reviewed at regular intervals, and the results should be discussed with the veterinary team. ### The Quality Control Log The quality control log records the results of the positive and negative controls that are run with each batch of tests. The controls verify that the test kit is working correctly. A positive control that produces a negative result indicates a problem with the test kit or the procedure. A negative control that produces a positive result indicates contamination or a problem with the test kit. The quality control log should record the date, the test kit lot number, the control results, and the initials of the person who performed the control. The log should be reviewed regularly to identify patterns. A series of failed positive controls may indicate a storage problem. A series of failed negative controls may indicate a problem with the sample collection or the test procedure. The quality control log is distinct from the test event record. The quality control log records the performance of the test kit itself. The test event record records the performance of the test on a patient sample. Both are necessary for a complete quality program. ### The Interpretation of the Record The record system is only useful if the veterinarian uses it to make decisions. The veterinarian should review the practice-level summary at regular intervals and ask the following questions. Is the rate of positive results consistent with the expected prevalence of the disease in the local population? Is the rate of confirmatory testing appropriate? Are the confirmatory results consistent with the initial POC results? Are there any patterns of unexpected results? A pattern of positive results that are not confirmed by laboratory testing should trigger an investigation. The investigation should include a review of the test procedure, the storage conditions, the test kit lot numbers, and the training of the staff. The investigation should also consider the possibility that the confirmatory test is not the appropriate test for the situation. A pattern of negative results in animals with strong clinical signs should also trigger an investigation. The investigation should consider the window period of the test, the possibility of a different disease, and the possibility of a test failure. ### The Record as a Communication Tool The record is also a communication tool. The record allows the veterinarian to explain the test result to the owner with confidence. The record allows the veterinarian to show the owner that the positive result was confirmed by a second test. The record allows the veterinarian to show the owner that the negative result was interpreted in the context of the clinical signs and the window period. The American Veterinary Medical Association emphasizes that veterinarians should communicate clearly with pet owners about the health of their animals and the reasons for diagnostic and treatment decisions. The record supports this communication by providing a factual basis for the discussion. ### The Record as a Training Tool The record is a training tool for the veterinary team. New technicians can be trained to use the record system and to understand the importance of accurate documentation. The record can be used to demonstrate the consequences of a false positive or a false negative result. The record can be used to show the team how the practice-level summary is calculated and how the summary is used to improve the quality of the testing. The record should be reviewed with the team at regular intervals. The review should be a constructive discussion of the results and the patterns. The review should not be a punitive exercise. The goal is to improve the quality of the diagnostic process. ### The Record as a Legal Document The record is a legal document. The record should be accurate, complete, and legible. The record should be retained for the period required by the local regulations. The record should be available for review by the regulatory authorities. The record should be written in a way that is clear and objective. The record should not contain subjective opinions or speculation. The record should state the facts of the test and the interpretation of the result. ### The Record as a Research Tool The record can be used for research. The practice-level summary can be used to describe the prevalence of a disease in the local population. The confirmatory testing log can be used to evaluate the performance of a specific test in the practice population. The record can be used to identify the need for a change in the testing protocol. The record can also be used to contribute to the broader veterinary knowledge base. The World Small Animal Veterinary Association encourages the use of evidence-based practice and the collection of clinical data. The practice record is a source of such data. ### The Record as a Continuous Improvement Tool The record is the foundation of a continuous improvement program. The practice should set targets for the quality of the diagnostic process. The targets should include the rate of confirmatory testing, the rate of invalid results, and the rate of false positives and false negatives. The practice should monitor the record against these targets and make changes when the targets are not met. The practice should also review the record when a new test is introduced. The new test should be evaluated in the practice population before it is used for routine screening. The evaluation should include a comparison of the new test with the existing test and with the confirmatory test. ### The Record of the Test Kit The record should include the test kit information. The record should include the manufacturer, the product name, the lot number, the expiration date, and the date of receipt. The record should also include the storage conditions and the date of the first use. The record should be used to track the test kits from the receipt to the disposal. The record should be used to ensure that the test kits are used before the expiration date. The record should be used to ensure that the test kits are stored in the correct conditions. The record should be used to identify the test kits that are suspected of producing incorrect results. ### The Record of the Sample The record should include the sample information. The record should include the sample type, the date and time of the collection, the date and time of the testing, and the condition of the sample. The record should also include the person who collected the sample and the person who tested the sample. The record should be used to ensure that the sample is collected and tested correctly. The record should be used to identify the samples that are of poor quality. The record should be used to identify the samples that are tested after the recommended time. ### The Record of the Result The record should include the result of the test. The record should include the result as read, the time of the reading, and the person who read the result. The record should also include the interpretation of the result in the clinical context. The record should be used to ensure that the result is read correctly. The record should be used to identify the results that are read at the wrong time. The record should be used to identify the results that are interpreted incorrectly. ### The Record of the Decision The record should include the decision that is made based on the result. The record should include the treatment decision, the isolation decision, and the confirmatory testing decision. The record should also include the rationale for the decision. The record should be used to ensure that the decision is made in the best interest of the animal. The record should be used to identify the decisions that are made without the confirmatory testing. The record should be used to identify the decisions that are made without the clinical context. ### The Record of the Outcome The record should include the outcome of the case. The record should include the final diagnosis, the response to treatment, and the outcome of the animal. The record should also include the outcome of the confirmatory testing. The record should be used to evaluate the accuracy of the test. The record should be used to evaluate the accuracy of the decision. The record should be used to improve the diagnostic process. ### The Record of the Communication The record should include the communication with the owner. The record should include the explanation of the result, the explanation of the decision, and the explanation of the follow-up. The record should also include the questions of the owner and the answers of the veterinarian. The record should be used to ensure that the owner is informed. The record should be used to ensure that the owner understands the result and the decision. The record should be used to ensure that the owner is satisfied with the care. ### The Record of the Training The record should include the training of the staff. The record should include the training of the new staff, the training of the existing staff, and the training of the staff on the new test. The record should also include the assessment of the staff. The record should be used to ensure that the staff is trained. The record should be used to ensure that the staff is competent. The record should be used to ensure that the staff is up to date. ### The Record of the Audit The record should be audited at regular intervals. The audit should be performed by a person who is not involved in the testing. The audit should review the completeness of the record, the accuracy of the record, and the compliance with the protocol. The audit should be used to identify the problems in the record. The audit should be used to identify the problems in the testing. The audit should be used to improve the quality of the record. ### The Record of the Improvement The record should be used to improve the diagnostic process. The record should be used to identify the areas of the improvement. The record should be used to implement the improvement. The record should be used to evaluate the improvement. The record should be used to improve the quality of the care. The record should be used to improve the outcome of the animal. The record should be used to improve the satisfaction of the owner. ### The Record of the Practice The record is the practice. The record is the memory of the practice. The record is the knowledge of the practice. The record is the improvement of the practice. The record should be maintained. The record should be protected. The record should be used. The record should be shared. The record should be the basis of the practice. ### The Record of the Future The record is the future. The record is the basis of the future. The record is the foundation of the future. The record is the future of the practice. The record should be used to plan the future. The record should be used to prepare the future. The record should be used to improve the future. The record should be used to build the future. The record is the most important tool in the diagnostic process. The record is the tool that allows the veterinarian to make the correct decision. The record is the tool that allows the veterinarian to provide the best care. The record is the tool that allows the veterinarian to improve the practice. The record is the tool that allows the veterinarian to serve the animal and the owner. ## Frequently Asked Questions ### What is the difference between a point-of-care antigen test and a PCR test? A point-of-care antigen test detects the presence of a specific protein produced by the infectious agent. A PCR test detects the genetic material of the infectious agent. The PCR test is more sensitive and can detect the infection earlier, but it requires a laboratory and takes longer to produce a result. ### When should I use a point-of-care antigen test? A point-of-care antigen test should be used when a rapid result is needed for a clinical decision. The test is useful for the screening of animals for a disease and for the confirmation of a diagnosis. ### When should I use a PCR test? A PCR test should be used when the result of the antigen test is not consistent with the clinical picture. The PCR test is also used when the antigen test is negative but the clinical signs are strong. ### What is the window period for a point-of-care antigen test? The window period is the period between the infection and the time when the antigen is detectable. The window period varies with the disease and the test. The window period can be several weeks for heartworm and a few days for parvovirus. ### What is the difference between a false positive and a false negative result? A false positive result is a positive result when the animal is not infected. A false negative result is a negative result when the animal is infected. The false positive result can lead to unnecessary treatment. The false negative result can lead to a delay in treatment. ### How can I confirm a positive result? A positive result can be confirmed with a different test. The confirmatory test can be a laboratory test or a different POC test. The confirmatory test can also be a repeat test. ### How can I confirm a negative result? A negative result can be confirmed with a different test. The confirmatory test can be a laboratory test or a different POC test. The confirmatory test can also be a repeat test. ### What is the role of the veterinarian in the use of a POC antigen test? The veterinarian is responsible for the interpretation of the result and the decision-making. The veterinarian should be aware of the limitations of the test and the clinical context. The veterinarian should be able to communicate the result to the owner. ## Using the Evidence | Source | Best use in this topic | Important limitation | |---|---|---| | [Pet Care](https://www.avma.org/resources-tools/pet-owners) | official guidance | Check the linked page for current local requirements | | [AAHA Guidelines](https://www.aaha.org/resources) | official guidance | Check the linked page for current local requirements | | [Global Guidelines](https://wsava.org/global-guidelines) | official guidance | Check the linked page for current local requirements | ## Related Veterinary Guides - [Shock Wave Therapy in Veterinary Medicine: Mechanisms and Clinical Use](/knowledge/veterinary-medicine/emergency-critical-care/shock-wave-therapy-veterinary-medicine-mechanisms-clinical-use) - [Extra-Label Drug Use in Veterinary Medicine: Legal and Clinical Considerations](/knowledge/veterinary-medicine/clinical-pharmacology/extra-label-drug-use-veterinary-medicine-legal-clinical-considerations) - [Point-of-Care Ultrasound in Veterinary Shock Assessment](/knowledge/veterinary-medicine/emergency-critical-care/point-of-care-ultrasound-veterinary-shock-assessment) - [Point-of-Care Testing in Veterinary Practice: Benefits and Limitations](/knowledge/veterinary-medicine/clinical-pathology/point-of-care-testing-veterinary) - [Constructing Clinical Prediction Rules for Veterinary Medicine](/knowledge/veterinary-medicine/veterinary-research-methods/constructing-clinical-prediction-rules-veterinary-medicine) ## References and Further Reading - [Pet Care](https://www.avma.org/resources-tools/pet-owners). American Veterinary Medical Association. - [AAHA Guidelines](https://www.aaha.org/resources). American Animal Hospital Association. - [Global Guidelines](https://wsava.org/global-guidelines). World Small Animal Veterinary Association. - [Merck Veterinary Manual](https://www.merckvetmanual.com/). Merck Veterinary Manual. - [Cornell University College of Veterinary Medicine](https://www.vet.cornell.edu/). Cornell University. - [Animal Health and Welfare](https://www.woah.org/en/what-we-do/animal-health-and-welfare). World Organisation for Animal Health. - [Evaluation of a Revised Point-of-Care Test for the Detection of Feline Leukaemia p27 Antigen and Anti-p15E Antibodies in Cats.](https://pubmed.ncbi.nlm.nih.gov/38675954). Viruses, 2024. - [Reproducibility matters: intra- and inter-sample variation of the point-of-care circulating cathodic antigen test in two Schistosoma mansoni endemic areas in Uganda.](https://pubmed.ncbi.nlm.nih.gov/37598698). Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 2023. - [A point-of-care testing assay for clonorchiasis using a EuNPs-CsTR1 fluorescent probe-based immunoassay.](https://pubmed.ncbi.nlm.nih.gov/38656957). PLoS neglected tropical diseases, 2024. - [Sensitivity and specificity of human point-of-care circulating cathodic antigen (POC-CCA) test in African livestock for rapid diagnosis of schistosomiasis: A Bayesian latent class analysis.](https://pubmed.ncbi.nlm.nih.gov/37216407). PLoS neglected tropical diseases, 2023. - [A tumor-on-a-chip for in vitro study of CAR-T cell immunotherapy in solid tumors.](https://pubmed.ncbi.nlm.nih.gov/41107533). Nature biotechnology, 2026. > This article is educational and is not a substitute for veterinary diagnosis or treatment. Contact a veterinarian for advice about an individual animal.