Case Report vs Original Research Article

A case report describes individual patients to illustrate a lesson; an original research article answers a defined research question with a planned design, a sample and a statistical analysis. Original research can estimate frequency, associations or effects, whereas a case report cannot.

Comparison

Choosing

• If you have an interesting individual case with a lesson, write a case report.
• If you have a question you can test with data, design an original study.
• If you have many cases and want to describe features, consider a case series or a cross-sectional study.

Illustrative example

Invented for teaching. A student sees a patient with an unexpected drug reaction (case report). She then asks, "How common is this reaction among patients given the drug in our hospital?" That requires a retrospective cohort study with defined criteria, a denominator and analysis, which is an original research article.

Moving from a case to a study

If a case sparks a question, write the question down and look at the literature. Then ask whether data exist that could answer it, such as a registry or hospital records. Plan the design, outcome definitions and analysis before looking at the data, obtain ethics approval or an exemption decision, and report with the guideline that matches your design. Some authors publish the original case report first and later conduct the study; both outputs should reference each other honestly.

Common pitfalls

• Presenting a case series as proof of frequency.
• Using a research label for a descriptive account.

Key takeaways

• The difference lies in the question and the design.
• Choose the format that your data can support.

This page is general educational information about research methods. It is not medical, legal or regulatory advice; follow your institution's ethics board and your target journal's instructions.