# What Blood Tests Are Needed Before Starting Your Dog on Apoquel?


## Key Takeaways

- A baseline complete blood count (CBC) and biochemistry panel are recommended prior to initiating Apoquel to assess red blood cell, white blood cell, and platelet counts, as well as liver enzymes (ALT, ALP) and kidney function markers (BUN, creatinine).
- The biochemistry panel is critical for evaluating liver and kidney health, as Apoquel is metabolized by the liver and excreted by the kidneys; compromised organ function can lead to unsafe drug accumulation.
- A baseline blood work profile establishes a reference point, enabling veterinarians to detect potential drug-induced organ changes over time by comparing future results to initial values.
- While Apoquel targets the immune pathway driving pruritus, it does not diagnose the underlying cause of itching, which can include flea, food, or environmental allergies, as well as parasitic infestations or endocrine disorders.
- Urgently seek emergency veterinary care for signs of collapse, seizures, difficulty breathing, uncontrollable vomiting, pale gums, or inability to ambulate, as these may indicate severe adverse reactions or concurrent life-threatening conditions.

---

If your dog has been prescribed Apoquel for itchy skin or allergies, you are probably wondering what happens next. The short answer is that most veterinarians recommend a blood test before the first dose. This is not a formality. The test gives your vet a picture of how your dog's liver and kidneys are working, which helps them decide whether Apoquel is a safe choice for your individual dog. The test also creates a baseline. If your dog takes Apoquel for months or years, your vet can compare later blood work against that first sample to catch problems early.

You do not need to do anything special to prepare for this blood draw. Your vet may ask for a fasting sample, meaning no food for 8 to 12 hours, but many clinics do not require fasting for these particular tests. Just follow whatever instruction your clinic gives you. The blood draw itself takes a few minutes and is usually done from a vein in your dog's front leg or neck. Most dogs tolerate it well, and the whole visit is typically under an hour.

## Is This an Emergency?

Starting Apoquel is a routine event for most dogs. The blood test itself is not an emergency procedure. However, you should know which signs mean you need urgent care, because some dogs have underlying conditions that this medication can worsen.


<!-- figure:auto -->
```figure
{
 "type": "triage",
 "title": "Urgency triage by severity of signs",
 "tiers": [
  {
   "tier": "danger",
   "label": "Go to an emergency vet now",
   "signs": [
    "Collapse, seizures, difficulty breathing, vomiting that will not stop, pale or white gums, or your dog cannot stand or walk normally"
   ],
   "action": [
    "Stop giving Apoquel if already started",
    "Call your emergency vet and go immediately",
    "Do not wait to see if it passes"
   ]
  },
  {
   "tier": "warn",
   "label": "Book a same-day appointment",
   "signs": [
    "New or worsening vomiting, diarrhea, loss of appetite lasting more than 24 hours, unusual lethargy, or your dog seems painful or uncomfortable"
   ],
   "action": [
    "Call your regular vet as soon as they open",
    "Keep your dog quiet and offer small amounts of water",
    "Do not give another dose until you have spoken to a vet"
   ]
  },
  {
   "tier": "safe",
   "label": "Watch at home for 24 hours",
   "signs": [
    "Mild drowsiness on the first day, a single soft stool, or slightly reduced appetite that resolves within one meal"
   ],
   "action": [
    "Monitor your dog closely",
    "If any sign worsens, moves up a level, or lasts beyond 24 hours, contact your vet"
   ]
  }
 ]
}
```

| Urgency Level | Signs to Watch For | What to Do |
|---|---|---|
| Go to an emergency vet now | Collapse, seizures, difficulty breathing, vomiting that will not stop, pale or white gums, or your dog cannot stand or walk normally | Stop giving Apoquel if already started. Call your emergency vet and go immediately. Do not wait to see if it passes. |
| Book a same-day appointment | New or worsening vomiting, diarrhea, loss of appetite lasting more than 24 hours, unusual lethargy, or your dog seems painful or uncomfortable | Call your regular vet as soon as they open. Keep your dog quiet and offer small amounts of water. Do not give another dose until you have spoken to a vet. |
| Watch at home for 24 hours | Mild drowsiness on the first day, a single soft stool, or slightly reduced appetite that resolves within one meal | Monitor your dog closely. If any sign worsens, moves up a level, or lasts beyond 24 hours, contact your vet. |

If your dog has never had blood work and you are about to start Apoquel, do not skip the test to save time or money. The test is quick and the information it provides can prevent a serious reaction.

## What the Baseline Blood Work Checks

The main tests your vet will run are a complete blood count and a biochemistry panel. A complete blood count, often called a CBC, measures red blood cells, white blood cells, and platelets. Red blood cells carry oxygen. White blood cells fight infection. Platelets help blood clot. This test tells your vet whether your dog has anemia, an infection, or a bleeding problem.

The biochemistry panel is the part that matters most for Apoquel. This test measures organ function, especially the liver and kidneys. Two liver values are particularly important. Alanine aminotransferase, or ALT, is an enzyme that leaks into the blood when liver cells are damaged. Alkaline phosphatase, or ALP, is another enzyme that can rise with liver disease or with certain medications. High levels of either one can mean the liver is stressed.

Kidney function is checked with two main values. Blood urea nitrogen, or BUN, is a waste product that healthy kidneys filter out. Creatinine is another waste product from muscle activity. If both are high, it often means the kidneys are not filtering properly. Your vet will look at these numbers together, not in isolation, because dehydration alone can raise BUN.

## Why Apoquel Needs This Information

Apoquel works by blocking a specific pathway in the immune system that drives itching. It is effective for many dogs with allergic skin disease. But the medication is processed by the liver and cleared by the kidneys. If either organ is already compromised, the drug can build up in the body to unsafe levels.

The FDA, which regulates animal drugs in the United States, lists liver and kidney disease as conditions that require careful consideration before using Apoquel. The drug's label warns that safety in dogs with these conditions has not been fully established. This is why your vet wants to see your dog's organ values before writing that first prescription. A dog with mild kidney disease might still be able to take Apoquel, but your vet may choose a lower dose or a different medication entirely.

The baseline also protects your dog over time. If your vet knows your dog's normal ALT was 40, and a year later it is 200, that change is meaningful. Without the baseline, a single high reading is harder to interpret. It could be a new problem, or it could have been there all along.

## What Else Could Be Going On

Itchy skin in dogs has many causes, and Apoquel only treats one category. Allergies to fleas, food, or environmental substances are the most common reasons for itching. But skin infections from bacteria or yeast can also cause intense scratching, and these require different treatment. Mites, such as those that cause mange, produce similar signs. Some dogs itch because of a hormonal condition like hypothyroidism, where the thyroid gland does not produce enough hormone.

Your vet may recommend a skin scrape, where they gently scrape the surface of the skin to look for mites under a microscope. They may also suggest a food trial, where your dog eats a special diet for 8 to 12 weeks to see if symptoms improve. Blood work does not diagnose allergies. It only checks whether your dog is healthy enough for the medication. If your dog's blood work is normal, the next step is usually a trial of Apoquel to see if the itching responds.

## What to Expect at the Visit

Your vet will take a history, asking when the itching started, what it looks like, and whether anything in your dog's routine has changed. They will examine your dog's skin, ears, and coat. Then they will draw blood. Results may be ready in 15 to 30 minutes if the clinic has an in-house laboratory, or they may be sent to an outside lab with results in 24 to 48 hours.

If the blood work is normal, your vet will prescribe Apoquel and tell you exactly how much to give and for how long. Dosing is based on your dog's weight, and it must come from your veterinarian. Never give a dose based on a friend's dog or an online chart. The FDA's guidance on giving pet medication safely emphasizes that you should always follow your veterinarian's instructions and ask questions if anything is unclear. The American Veterinary Medical Association also advises pet owners to keep a list of all medications their dog takes and to share that list with every vet they see.

If the blood work shows a problem, your vet will explain what it means and what the options are. That might mean choosing a different anti-itch medication, treating the underlying organ issue first, or repeating the blood test in a few weeks. Whatever the result, you will leave with a clear plan and a better understanding of your dog's health.

## What You Can Do at Home Right Now

If your dog is itchy but otherwise eating, drinking, and acting normally, you can take a few safe steps while you wait for the veterinary visit. Bathe your dog with a gentle, fragrance-free shampoo made for dogs. Cool water can soothe hot, irritated skin. Keep your dog from scratching by using an Elizabethan collar, often called a cone, especially when you cannot supervise. You can also wipe your dog's paws and belly with a damp cloth after walks to remove pollen or dust.

Do not give your dog any human allergy medication. Many human antihistamines and decongestants are toxic to dogs, and even the ones that are sometimes used require a veterinarian to determine the correct dose. Do not apply creams, ointments, or sprays meant for people. Some contain ingredients that are dangerous if licked. Do not give your dog a bath with medicated shampoo unless your veterinarian recommended it. Some medicated shampoos can worsen certain skin infections.

Watch for signs that need immediate care. If your dog is vomiting repeatedly, has diarrhea with blood, collapses, has trouble breathing, or develops swelling of the face or throat, stop home care and go to an emergency veterinary clinic now. These signs can indicate a life-threatening reaction or another serious illness that has nothing to do with allergies.

## What to Write Down Before You Call

A short list of observations helps your veterinarian give better advice. Write down when the itching started. Count how many times per hour your dog scratches, licks, or chews. Note whether the itching is worse at night, after meals, or after being outdoors. Look at the skin and describe what you see. Red patches, raised bumps, scabs, hair loss, greasy skin, or a bad smell all matter.

Measure your dog's breathing rate at rest. Count the number of breaths in one minute while your dog is sleeping or lying quietly. A normal resting rate is usually between 10 and 30 breaths per minute, but your veterinarian can tell you what is normal for your dog. Check your dog's gum color. Healthy gums are pink. Pale, white, blue, or brick-red gums are concerning. Note how much water your dog drinks in a day and how often they urinate. Write down any changes in appetite, energy, or bathroom habits.

List every medication, supplement, or flea and tick product your dog receives, including how often you give it. Include anything your dog might have eaten that is not part of their normal diet. Bring this list to the appointment.

## The Test List and Why Each Test Matters

Your veterinarian will likely recommend a small set of baseline blood tests before starting Apoquel. The goal is to make sure your dog's body can handle the medication safely.

| Test | What It Checks | Why It Matters Before Apoquel |
|------|----------------|------------------------------|
| Complete blood count (CBC) | Red blood cells, white blood cells, and platelets | Detects anemia, infection, or inflammation that could change the treatment plan |
| Blood chemistry panel | Kidney values such as BUN and creatinine | Apoquel is processed by the body, and kidney function affects how the drug is handled |
| Liver enzymes such as ALT and ALP | Liver health and bile flow | Liver disease can change how medications are broken down and cleared |
| Total protein and albumin | Protein levels in the blood | Low protein can signal chronic illness or poor nutrition |
| Urinalysis | Urine concentration, protein, and signs of infection | Confirms the kidneys are working and rules out hidden urinary tract disease |

Some clinics also recommend a test for heartworm and tick-borne disease, especially if your dog has not been tested recently. These infections can cause skin signs that look like allergies. Treating the wrong problem wastes time and money.

The exact tests vary by clinic and by your dog's age, breed, and history. A young, healthy dog may need only a basic panel. An older dog or a dog with other health conditions may need a more detailed workup. Your veterinarian will explain what they recommend and why.

## What the Veterinary Visit Usually Involves

The visit starts with a physical examination. Your veterinarian will look at your dog's skin, ears, and paws. They will feel the lymph nodes, listen to the heart and lungs, and check the abdomen. They will ask about the itching history, diet, flea control, and any other medications.

The blood draw takes only a few minutes. Most dogs tolerate it well. Results may be ready in 15 to 30 minutes if the clinic has an in-house laboratory, or they may be sent to an outside lab and take a day or two. Your veterinarian will not start Apoquel until the results are reviewed.

The cost of the visit and blood work depends on your region, the clinic, and your dog's needs. A basic office visit might range from 50 to 150 dollars. Blood panels often range from 100 to 300 dollars, and a urinalysis adds roughly 30 to 80 dollars. These are general ranges only. Prices vary widely, so ask your clinic for an estimate before the tests are run.

If the blood work is normal, your veterinarian will prescribe Apoquel and tell you the exact dose for your dog. Dosing depends on your dog's weight and must come from the treating veterinarian. Never adjust the dose on your own. If the blood work shows a problem, your veterinarian may delay the medication, investigate the cause, or choose a different treatment.

## When an Online Vet Can Help, and When It Cannot

Any situation in this article that involves a dog who is vomiting, collapsing, struggling to breathe, or showing signs of a severe allergic reaction requires hands-on care. Do not use a remote consultation for these. Go to an emergency clinic immediately. A dog with a suspected blockage, bloat, or poisoning also needs in-person care without delay. A remote vet cannot examine your dog's abdomen, listen to the chest, take a temperature, run blood work, or image anything.

A remote consultation is genuinely useful for early or mild itching when your dog is otherwise stable. It can help you decide whether a sign warrants a visit. It works well for a recheck on a known skin problem, a question about a medication side effect, or a follow-up on a chronic condition. A veterinarian on video can take a detailed history, look at visible skin changes, and advise you on next steps. In many states they can prescribe, but prescribing rules differ by state. Some states require an in-person examination before a prescription is written. Your veterinarian may also require blood work before starting Apoquel, and that blood work cannot be done remotely.

The safest approach is to use a remote consultation as a triage tool, not as a replacement for a physical exam. If the remote vet recommends an in-person visit, take that advice seriously. Your dog's health depends on a complete picture, and some problems are only visible or detectable through hands-on testing.

## Common Mistakes Owners Make Before and During Apoquel Treatment

Many owners worry about the blood test itself, but the bigger risks come from small everyday decisions. Here are the mistakes seen most often, and what to do instead.

| Mistake or myth | What to do instead |
| --- | --- |
| Skipping the blood test to save money or time | Ask your vet about a payment plan. The test protects your dog from avoidable harm. |
| Giving a leftover dose from a previous course | Never reuse old medication. Dosing must come from the treating veterinarian. |
| Stopping the drug suddenly when the dog looks better | Finish the course your vet prescribed, then ask about tapering or stopping. |
| Hiding other medications from your vet | List every pill, flea product, supplement, and herbal remedy at the visit. |
| Assuming one blood test is enough forever | Ask your vet how often rechecks are needed. Many dogs need periodic monitoring. |
| Giving the drug to a second dog in the home | Each dog needs their own exam and blood work. Never share prescription medication. |

The most dangerous mistake is delaying care when your dog shows a serious sign. If your dog vomits repeatedly, has bloody diarrhea, collapses, has trouble breathing, or develops facial swelling, stop the medication and seek in-person emergency care immediately. Do not wait for a phone call or video visit.

Another common error is assuming the blood test result is the only safety check. The physical exam matters just as much. Your vet will feel your dog's abdomen, check gum color, and listen to the heart. These findings combine with the blood work to form the full picture.

## How to Reduce the Chance of Problems

Start with the baseline blood work your vet recommends. This gives a snapshot of your dog's liver and kidney function before any medication begins. The [FDA's guidance on safe use of pet medications](https://www.fda.gov/animal-veterinary/animal-health-literacy/how-give-your-pet-medicine-safely) explains why following the label and your vet's instructions matters.

Keep a written log while your dog is on Apoquel. Write down the date, the dose given, and any changes you notice. Record how many times your dog drinks in a day, how often they urinate, and whether their appetite stays steady. This log helps your vet spot trends that a single visit might miss.

Store the medication exactly as directed. Some drugs need refrigeration, others do not. Check the label and ask your vet if you are unsure. Keep the bottle out of reach of children and other pets.

Do not combine Apoquel with other allergy treatments without asking. Antihistamines, steroids, and medicated shampoos all interact differently. Your vet can tell you which combinations are safe and which are redundant.

Feed your dog a consistent diet. Sudden food changes can cause stomach upset that looks like a drug reaction. If you need to switch foods, do it gradually over a week by mixing the old and new food.

## What Recovery and Ongoing Management Usually Look Like

Most dogs show improvement in itching within 24 to 48 hours of the first dose. Full effect often takes 4 to 7 days. If you see no change after a week, call your vet. The dose may need adjustment, or another condition may be present.

Apoquel is not a cure for allergies. It manages the signs while the underlying cause continues. Many dogs stay on the drug for months or years. Others use it only during allergy season. Your vet will decide the length based on your dog's response and the blood work results.

Recheck blood work is common at 3 to 6 months after starting, then every 6 to 12 months for long-term use. This monitoring catches changes in liver or kidney values early, when they are easier to manage. The [American Veterinary Medical Association's pet owner resources](https://www.avma.org/resources-tools/pet-owners) describe why regular veterinary visits support long-term medication safety.

If your dog develops an infection while on Apoquel, such as a skin or urinary tract infection, the vet will treat that separately. Apoquel does not prevent infections. Watch for signs like increased thirst, straining to urinate, or a foul odor from the skin.

Some dogs need additional therapy alongside Apoquel. Allergy testing, immunotherapy, fatty acid supplements, or prescription diets can reduce the total medication needed. Ask your vet whether any of these could help your dog.

## Frequently Asked Questions

**Can my dog take Apoquel without any blood test?**
Some vets will prescribe it without baseline blood work, especially for a young, healthy dog. However, the test is strongly recommended because it reveals hidden liver or kidney problems that could make the drug unsafe. If your vet offers to skip it, ask why. You can always request the test anyway. The cost is modest compared with treating a drug-related complication. For older dogs or those with other illnesses, blood work is not optional. It is a safety requirement.

**How often does my dog need blood work while on Apoquel?**
Most vets recommend a recheck at 3 to 6 months after starting, then every 6 to 12 months for dogs on long-term therapy. The exact schedule depends on your dog's age, health, and blood test results. If your dog develops new signs like increased thirst, vomiting, or lethargy, do not wait for the scheduled recheck. Call your vet and ask whether an earlier test is needed.

**What happens if the blood test shows a liver problem?**
Your vet will likely delay starting Apoquel until the liver issue is investigated. The drug is processed by the liver, so a damaged liver may not clear it safely. Your vet may run additional tests to find the cause of the liver problem. In some cases, a different allergy medication is a better choice. Never start Apoquel on your own if a liver problem is known or suspected.

**Can I give Apoquel with my dog's other allergy medicine?**
Only if your vet approves. Combining Apoquel with steroids or certain other drugs can increase the risk of side effects. Your vet needs to know every medication your dog takes, including flea and tick preventives and supplements. Some combinations are safe and even helpful, but the decision must come from a professional who knows your dog's full history.

**My dog is itching again after months on Apoquel. Is the drug failing?**
Not necessarily. The dose may need adjustment, or the underlying allergy may have worsened. It is also possible a new condition has developed, such as a skin infection or food allergy. Do not increase the dose on your own. Schedule a recheck. Your vet may recommend blood work, a skin exam, or a change in the treatment plan.

**Is Apoquel safe for a dog with kidney disease?**
This depends on the severity of the kidney disease and the overall health of the dog. The blood test will show how well the kidneys are functioning. Some dogs with mild kidney disease can take Apoquel with careful monitoring. Others cannot. Your vet will weigh the benefits against the risks and may recommend an alternative. Do not start the drug without this discussion.

## Related Clinical & Scientific Guides

* [What Are the Side Effects of Bravecto for Dogs? What to Watch For](/knowledge/veterinary-medicine/pet-medication-guide/bravecto-side-effects-dogs)
* [Can You Give Your Dog Human Allergy Medicine? Whats Safe](/knowledge/veterinary-medicine/pet-medication-guide/dog-human-allergy-medicine-safe)
* [Can You Give Your Dog Dramamine for Car Sickness?](/knowledge/veterinary-medicine/pet-medication-guide/dog-dramamine-car-sickness)


## References and Further Reading

- [FDA Center for Veterinary Medicine Animal Drug Information](https://www.fda.gov/animal-veterinary)
- [FDA Safe Use of Pet Medications](https://www.fda.gov/animal-veterinary/animal-health-literacy/how-give-your-pet-medicine-safely)
- [AVMA Pet Owner Resources](https://www.avma.org/resources-tools/pet-owners)
- [MSD Veterinary Manual Pet Owner Version](https://www.msdvetmanual.com/pet-owners)
- [AAHA Pet Owner Resources](https://www.aaha.org/for-pet-parents/)

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- [What to Expect When Your Dog Needs a Blood Test Before Starting Pain Medication](/knowledge/veterinary-medicine/pet-medication-guide/dog-blood-test-before-pain-medication)
- [What to Expect When Your Dog Needs a Skin Scrape Before Allergy Medication](/knowledge/veterinary-medicine/pet-medication-guide/dog-skin-scrape-allergy-medication)
- [What to Expect When Your Dog Needs a Urine Test Before Starting Seizure Medication](/knowledge/veterinary-medicine/pet-medication-guide/dog-urine-test-before-seizure-medication)
- [What to Expect When Your Dog Needs a Fecal Test Before Deworming](/knowledge/veterinary-medicine/pet-medication-guide/dog-fecal-test-before-deworming)
- [What to Expect When Your Dog Needs a Heartworm Test Before Getting Prevention](/knowledge/veterinary-medicine/pet-medication-guide/dog-heartworm-test-before-prevention)

> This article is general educational information for pet owners. It is not a substitute for veterinary diagnosis, examination, or treatment. If your pet is showing severe or rapidly worsening signs, contact an emergency veterinary hospital immediately.