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A case series (also known as a clinical series) is a medical research study that tracks patients with a known exposure or examines their medical records for exposure and outcome. A case series can be retrospective or prospective and usually involves a smaller number of patients than more powerful case-control studies or randomized controlled trials.

A case series is a type of observational study. Case series may be consecutive or non-consecutive, depending on whether all cases presenting to the reporting authors over a period of time were included, or only a selection.

Categroy:Research methods

v·d·e Biomedical research: Clinical study design / Design of experiments
Overview	Clinical trial Clinical trial protocol Clinical study design
Controlled study (EBM I to II-1; A to B)	Randomized controlled trial (Blind experiment, Open-label trial)
Observational study (EBM II-2 to II-3; B to C)	Cross-sectional study vs. Longitudinal study, Ecological study Cohort study (Retrospective cohort study, Prospective cohort study) Case-control study (Nested case-control study) Case series Case study Case report
Epidemiology/ methods	occurrence: Incidence (Cumulative incidence) Prevalence (Point prevalence, Period prevalence) association: absolute (Absolute risk reduction, Attributable risk, Attributable risk percent) relative (Relative risk, Odds ratio, Hazard ratio) other: Virulence Infectivity Mortality rate Morbidity Case fatality Specificity and sensitivity Likelihood-ratios Pre/post-test probability
Trial/test types	In vitro In vivo Animal testing Animal testing on non-human primates First-in-man study Multicenter trial Seeding trial Vaccine trial
Analysis of clinical trials	Risk–benefit analysis Systematic review Meta-analysis
Interpretation of results	Selection bias Correlation does not imply causation Null result
* Category Glossary List of topics

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