How to Compare Your Results to Published Literature in a Lab Report Discussion
By Dr. Zubair Khalid, DVM, MS, PhD ·
Quick Answer
- Compare your results to published literature by first identifying the specific variables, methods, and populations in your study, then searching for peer-reviewed papers that match those parameters.
- Use reporting guidelines from the EQUATOR Network to structure your discussion and ensure you address all relevant comparisons transparently.
- A key limitation is that no two studies are identical, so differences in methodology, sample size, or conditions may explain discrepancies without indicating an error in your work.
Understanding the Purpose of a Lab Report Discussion
The discussion section of a lab report serves a distinct function that differs from the results section. While the results section presents what you observed, the discussion interprets those observations in the context of existing knowledge. This interpretation requires you to compare your findings with published literature, identify agreements and disagreements, and explain what your results contribute to the broader scientific conversation.
For students and early-career researchers, this comparison can feel overwhelming. The scientific literature is vast, and knowing where to start searching, how to evaluate sources, and how much to cite requires a systematic approach. This article provides a practical method for locating credible sources and integrating them into your discussion without overdoing it.
The process involves three main phases: preparing your search strategy, locating and evaluating relevant studies, and writing the comparison in a way that strengthens your argument. Each phase requires specific skills and attention to detail.
Preparing Your Search Strategy
Before you begin searching for literature, you need to clarify what you are looking for. A focused search strategy saves time and produces more relevant results than a broad, unfocused search.
Identify Your Key Variables and Methods
Start by listing the main components of your experiment. These include your independent variable, dependent variable, control conditions, organism or material studied, and the specific methods you used. For example, if you measured the effect of temperature on enzyme activity in a plant extract, your search terms should include the enzyme name, the organism, the temperature range, and the assay method.
Write these terms down before you start searching. This list becomes your search vocabulary. You will combine these terms in different ways to find papers that match your study design.
Define Your Comparison Questions
Decide what you actually want to learn from the literature. Common comparison questions include:
- Do my results agree with published values for the same measurement?
- Do my results follow the same trend or pattern described in previous studies?
- Are my results different from published findings, and if so, what methodological differences might explain this?
- Does my study support or challenge a particular theory or model?
Having specific questions prevents you from collecting citations that are only tangentially related to your work. Each source you include should help answer at least one of your comparison questions.
Choose Your Search Databases
The National Library of Medicine provides access to authoritative biomedical books and research-method references through its Bookshelf platform. This resource can help you understand research methodology and locate foundational texts in your field. For most life-science lab reports, PubMed and Google Scholar are appropriate starting points, but you should also consider field-specific databases such as Web of Science, Scopus, or Agricola depending on your discipline.
Your institution's library website likely provides access to these databases and may offer tutorials on effective searching. Librarians can also help you refine your search strategy and identify relevant subject headings.
Locating Relevant Published Studies
Once you have your search strategy prepared, you can begin locating studies. The goal is to find papers that are directly relevant to your work and that come from credible sources.
Build Effective Search Queries
Combine your key terms using Boolean operators. Use AND to narrow your search, OR to broaden it, and quotation marks to search for exact phrases. For example, a search for "enzyme activity" AND "temperature" AND "plant extract" will return papers that mention all three concepts.
Pay attention to synonyms and alternative terms. Different authors may use different words for the same concept. For example, "cell viability" and "cell survival" may both be relevant to your study. Include these alternatives in your search to avoid missing important papers.
Screen Titles and Abstracts
You will likely retrieve many more papers than you can read in full. Screen the titles and abstracts to determine which papers are worth examining in detail. A paper is relevant if it measures the same variables, uses a similar method, studies a comparable system, or directly addresses your comparison questions.
Keep a record of the papers you identify as potentially relevant. Your record should include the full citation, the database where you found it, and a brief note about why it is relevant to your study.
Access Full Texts
Once you have a list of potentially relevant papers, obtain the full texts. Your institution's library provides access to many journals through subscription databases. If a paper is not available through your library, you can request it through interlibrary loan or check whether the authors have deposited a version in an open-access repository.
Evaluate Source Credibility
Not all published papers are equally reliable. When evaluating a source, consider the journal's reputation, the authors' affiliations, and whether the paper has been peer reviewed. The Committee on Publication Ethics Core Practices describe the responsibilities of journals and authors in maintaining research integrity, including proper handling of peer review, data, and conflicts of interest. Papers published in journals that follow these practices are more likely to meet professional standards.
You should also check whether the paper has been cited by other researchers and whether those citing papers support or challenge its findings. A paper that has been widely cited and replicated is generally more reliable than one that has received little attention.
Using Reporting Guidelines to Structure Your Comparison
Reporting guidelines provide a framework for presenting research in a transparent and complete manner. The EQUATOR Network maintains a comprehensive collection of reporting guidelines for different study types. These guidelines help you understand what information readers expect to see in a research paper and how to present your findings in a way that facilitates comparison with other studies.
Select the Appropriate Guideline
The EQUATOR Network allows you to search for guidelines by study type. For example, if you conducted a randomized controlled trial, you would use the CONSORT guideline. If you conducted a systematic review, you would use PRISMA. For laboratory experiments, the relevant guideline depends on the nature of your study.
Even if your lab report is not a formal research paper, consulting the relevant reporting guideline helps you understand what information is important to include and how to present it. This understanding improves the quality of your discussion and makes your comparisons more meaningful.
Use Guidelines to Identify Missing Information
Reporting guidelines list the items that should be reported for a given study type. When you compare your results to published literature, you can use these guidelines to check whether you have reported all the information readers need to evaluate your findings. For example, if the guideline indicates that you should report the sample size and how it was determined, and you have not included this information, you should add it before writing your discussion.
This approach also helps you identify information that is missing from the studies you are citing. If a published paper does not report a key methodological detail, you should note this limitation when comparing your results to that paper.
Writing the Comparison in Your Discussion
The discussion section is where you interpret your results and place them in the context of published literature. A well-written comparison does more than list papers that agree or disagree with your findings. It explains the significance of the agreement or disagreement and considers possible reasons for any discrepancies.
Structure Your Comparison Logically
Organize your discussion around themes or questions instead of around individual papers. For example, you might first discuss how your results compare to published values for the same measurement, then discuss how your results relate to studies that used different methods, and finally discuss the implications of your findings for the broader field.
Within each theme, cite the most relevant papers and explain how your results relate to their findings. Do not simply state that your results agree with a particular paper. Explain what the agreement means and why it is significant.
Describe Agreements and Discrepancies
When your results agree with published findings, state this clearly and explain what the agreement suggests. For example, if your measured value falls within the range reported by other studies, this supports the validity of your method and suggests that your results are reliable.
When your results differ from published findings, do not treat this as a failure. Discrepancies are common in science and often provide valuable insights. Consider possible explanations for the difference, such as variations in methodology, differences in the material or organism studied, or uncontrolled variables in your experiment. Discuss these possibilities honestly and suggest how future work might resolve the discrepancy.
Avoid Overcitation
Including too many citations can weaken your discussion by making it read like a list instead of an argument. A good rule is to cite the most relevant and credible sources for each point you make, instead of every paper you found during your search. Three to five well-chosen citations per major point are usually sufficient.
Prioritize recent papers and papers that are directly relevant to your specific findings. Older papers may still be important, especially if they established a key method or finding, but you should also show that you are aware of current work in the field.
Practical Steps for Comparing Your Results
The following steps provide a practical workflow for comparing your results to published literature. You can adapt these steps to your specific study and field.
Step 1: Create a Comparison Table
Create a table with columns for the study citation, the key variables measured, the methods used, the main findings, and notes on how the study relates to your work. Fill in this table as you read each paper. This table becomes the foundation for your discussion and helps you organize your thoughts.
Step 2: Identify Patterns Across Studies
After you have read several papers, look for patterns. Do most studies report similar values or trends? Are there outliers, and if so, what distinguishes them from the majority? Identifying these patterns helps you understand where your results fit in the broader literature.
Step 3: Draft Your Comparison Paragraphs
Using your comparison table and your notes on patterns, draft the paragraphs that compare your results to the literature. Each paragraph should focus on one theme or question and should cite the most relevant papers.
Step 4: Revise for Clarity and Focus
Read your draft critically. Does each paragraph make a clear point? Have you explained the significance of the agreement or disagreement? Have you cited the most relevant sources without overdoing it? Revise until your comparison is clear, focused, and well supported.
At a Glance
| Comparison Task | Recommended Approach | Common Mistake |
|---|---|---|
| Identifying relevant studies | Use a structured search with Boolean operators and synonyms | Searching with only one or two broad terms |
| Evaluating source credibility | Check journal reputation, peer review status, and citation history | Citing any paper that appears in search results |
| Structuring the discussion | Organize by themes or questions, not by individual papers | Listing papers without explaining their relevance |
| Handling discrepancies | Discuss methodological differences and suggest explanations | Ignoring or hiding results that differ from published findings |
| Deciding how much to cite | Cite the most relevant and credible sources for each point | Including excessive citations that weaken the argument |
Common Failure Patterns in Literature Comparison
Many lab reports struggle with the same issues when comparing results to published literature. Recognizing these patterns helps you avoid them in your own writing.
The Citation Dump
Some writers include a large number of citations without explaining how each one relates to their findings. This pattern makes the discussion difficult to read and fails to demonstrate understanding. Each citation should serve a purpose, whether it supports a claim, provides context, or offers a point of comparison.
The Agreement Bias
Some writers only cite papers that agree with their results and ignore studies that report different findings. This selective citation gives a misleading impression of the literature and weakens the credibility of the discussion. You should engage with studies that disagree with your results and explain possible reasons for the discrepancy.
The Method Mismatch
Some writers compare their results to studies that used very different methods without acknowledging the limitations of this comparison. For example, comparing results from a field study to results from a controlled laboratory experiment requires careful consideration of how the different conditions might affect the findings. Always note methodological differences when they are relevant.
The Missing Context
Some writers state that their results agree or disagree with a particular paper but do not explain why this matters. The discussion should interpret the comparison, beyond report it. Explain what the agreement or disagreement suggests about your findings and their implications.
Records and Measurements for Literature Comparison
Keeping good records during your literature search makes the writing process easier and helps you avoid errors in citation.
Maintain a Citation Log
Record the full citation for every paper you read, including authors, year, title, journal, volume, and pages. Note the database where you found the paper and the date you accessed it. This log helps you build your reference list and ensures that you can find the papers again if needed.
Track Your Search History
Record the search terms and databases you used, along with the number of results each search returned. This record helps you document your search process and allows you to repeat or refine your searches if necessary.
Note Key Findings and Methodological Details
For each paper you read, note the key findings and the methodological details that are relevant to your comparison. This note-taking helps you remember important information and makes it easier to write your discussion later.
Quality Controls for Your Literature Comparison
Several quality-control measures can improve the reliability of your literature comparison.
Verify Your Citations
Before submitting your lab report, verify that every citation is accurate and complete. Check the author names, year, title, journal, and page numbers against the original source. Incorrect citations are a common problem and can undermine the credibility of your work.
Check for Currency
Make sure you have included recent work in your field. While older papers may be important, your discussion should show that you are aware of current research. Search for papers published within the last five years and include them if they are relevant.
Seek Feedback
Ask a classmate, colleague, or instructor to read your discussion and provide feedback. A fresh reader can identify places where your comparison is unclear, where you have cited too many or too few sources, or where you have not explained the significance of your findings.
Professional Escalation Criteria
In some situations, you may need to seek additional help with your literature comparison.
When to Consult a Librarian
If you are having difficulty finding relevant papers, if you are unsure which databases to use, or if you cannot access the full text of a paper, consult a librarian. Librarians are trained to help with literature searches and can save you considerable time.
When to Consult Your Instructor
If you are unsure about the expectations for your lab report, if you are having difficulty interpreting your results, or if you are uncertain about how to handle a discrepancy between your results and the literature, consult your instructor. Instructors can provide guidance on the specific requirements for your assignment and can help you understand the context of your findings.
When to Consult a Writing Center
If you are struggling with the writing itself, including organization, clarity, or citation format, consult your institution's writing center. Writing tutors can help you improve your discussion and ensure that your comparison is well structured and clearly written.
Safety and Ethical Considerations
When comparing your results to published literature, you should be aware of the ethical responsibilities that come with using other researchers' work.
Avoid Plagiarism
You must cite any ideas, findings, or text that you take from published sources. Paraphrase the ideas in your own words and provide a citation. Direct quotations should be used sparingly and placed in quotation marks with a citation. Plagiarism is a serious ethical violation and can have severe consequences.
Report Your Results Honestly
Do not alter your results to make them agree with published findings. Your discussion should honestly report what you observed, even if your results differ from the literature. The Committee on Publication Ethics Core Practices emphasize the importance of honesty and integrity in research, including proper handling of data and reporting of results.
Respect Data-Sharing Expectations
Many funding agencies and journals now require researchers to share their data. The National Institutes of Health Data Management and Sharing Policy describes expectations for planning and implementing data sharing for NIH-funded research. Even if your lab report is not subject to these requirements, you should be aware of the growing expectation for transparency in research and consider how you would make your data available to others.
Understanding Your Role as a Researcher
Your lab report is part of a larger scientific conversation. When you compare your results to published literature, you are participating in this conversation and contributing to the collective knowledge of your field.
Maintain Your Researcher Identity
As you progress in your career, maintaining a consistent researcher identity becomes important. ORCID provides a persistent digital identifier that distinguishes you from other researchers and connects your work across different platforms. Creating an ORCID record and keeping it up to date helps ensure that your contributions are properly attributed.
Understand Funding and Research Context
If your work is part of a funded research project, you should be aware of the expectations that come with that funding. The National Institutes of Health Grants and Funding website provides information about grant policy, application, review, and award management. Understanding these expectations helps you appreciate the broader context of your research and the responsibilities that come with conducting scientific work.
Limitations of Literature Comparison
Comparing your results to published literature has inherent limitations that you should acknowledge in your discussion.
Publication Bias
Published literature may not represent all the research that has been conducted. Studies with positive or significant results are more likely to be published than studies with null or negative results. This publication bias means that the literature may overrepresent certain types of findings.
Methodological Differences
No two studies are identical. Differences in methods, materials, conditions, and analysis can all affect results. When you compare your findings to published literature, you should consider whether these differences are significant enough to explain any discrepancies.
Temporal Changes
Scientific knowledge evolves over time. Methods improve, new findings emerge, and theories are revised. A paper published twenty years ago may not reflect the current state of knowledge in your field. When comparing your results to the literature, consider the age of the sources you are using and whether more recent work has superseded older findings.
Frequently Asked Questions
How do I know if a source is credible enough to cite in my lab report?
Check whether the paper has been peer reviewed and published in a reputable journal. Consider the authors' affiliations and whether they have relevant expertise. Look at how many times the paper has been cited and whether other researchers have replicated its findings. Journals that follow the Committee on Publication Ethics Core Practices are more likely to maintain professional standards.
How many sources should I cite in my discussion section?
There is no fixed number, but quality matters more than quantity. Cite the most relevant and credible sources for each point you make. Three to five well-chosen citations per major point are usually sufficient. Avoid including excessive citations that do not add meaningfully to your argument.
What should I do if my results do not match any published studies?
First, verify that you have searched thoroughly and have not missed relevant papers. If your results genuinely differ from the literature, discuss possible explanations, such as methodological differences, variations in materials or conditions, or uncontrolled variables. A discrepancy is not necessarily an error. It may indicate that your study has identified something new or that your methods differ in important ways from previous work.
How do I cite a paper I found through a database like PubMed?
Cite the original paper, not the database where you found it. Use the citation format required by your instructor or institution, such as APA, MLA, or CSE. Include the full citation with authors, year, title, journal, volume, and pages. If you accessed the paper online, include the DOI or URL.
Should I cite papers that disagree with my results?
Yes. Engaging with studies that report different findings strengthens your discussion and demonstrates that you understand the complexity of the scientific literature. Explain possible reasons for the discrepancy and suggest how future work might resolve it.
How recent should my sources be?
Include recent work published within the last five years when possible, but do not ignore older papers that are still relevant. Foundational papers that established key methods or findings remain important even if they are old. Your discussion should show that you are aware of both the historical context and the current state of your field.
What is the EQUATOR Network and how can it help me?
The EQUATOR Network is an international initiative that maintains a comprehensive collection of reporting guidelines for health research. These guidelines help researchers present their work transparently and completely. Even for a lab report, consulting the relevant guideline can help you understand what information to include and how to structure your discussion.
How do I avoid plagiarism when comparing my results to published literature?
Paraphrase the ideas from published sources in your own words and provide a citation for each source. Use direct quotations sparingly and place them in quotation marks with a citation. Keep careful notes about which ideas came from which sources so you can cite accurately. Plagiarism is a serious ethical violation with potentially severe consequences.
Using the Evidence
| Source | Best use in this topic | Important limitation |
|---|---|---|
| Research Methods Resources | official guidance | Check the linked page for current local requirements |
| EQUATOR Network | official guidance | Check the linked page for current local requirements |
| Core Practices | official guidance | Check the linked page for current local requirements |
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References and Further Reading
- Research Methods Resources. National Library of Medicine.
- EQUATOR Network. EQUATOR Network.
- Core Practices. Committee on Publication Ethics.
- NIH Grants and Funding. National Institutes of Health.
- ORCID for Researchers. ORCID.
- Data Management and Sharing Policy. National Institutes of Health.
- NCBI Literature Resources. National Center for Biotechnology Information.
- PubMed. National Library of Medicine.
This article is educational and does not replace institutional policy, professional advice, or applicable safety and regulatory requirements.