Read the identity block first
Record the brief title, official title, NCT number, sponsor, responsible party, overall status, enrollment, and last-update-posted date. These fields establish which record you are reading and who maintains it. ClinicalTrials.gov’s record guide (opens in a new tab) explains that the introduction area holds status and administrative information.
Do not treat “Recruiting” as an assurance that the location near you has an opening. Check the location entry. Do not treat a sponsor name as the facility where visits occur. Sponsors, contract research organizations, recruitment vendors, and local sites may be separate entities.
Compare the summary with the detailed description
Read the brief summary to identify the study question. Then read the detailed description. Mark language about dose escalation, run-in periods, washouts, rescue medication, optional substudies, remote tasks, specimen storage, and long-term follow-up.
Recruitment copy may emphasize the condition or purpose. The detailed record can reveal repeated procedures, device requirements, or assignment methods. Missing detail is a question to ask. It is not proof of misconduct.
Read the design fields
| Field | What it tells you | Question to ask |
|---|---|---|
| Study type | Interventional, observational, or expanded access | Which activities happen because of research? |
| Allocation | Randomized or another assignment method | What is the assignment ratio, and can I choose? |
| Intervention model | Parallel, crossover, single-group, factorial, or sequential | How many periods or interventions could I experience? |
| Masking | Who knows the assigned intervention | When can assignment be revealed for safety? |
| Primary purpose | Treatment, prevention, diagnostic, supportive care, basic science, or another purpose | What direct benefit, if any, is expected for participants? |
Open each arm description and intervention description. Compare names, doses, schedules, devices, behavioral programs, or procedures. An arm label such as “experimental” does not describe its full workload.
Use outcome time frames to identify extended follow-up
Primary and secondary outcomes state what the study measures and when. The outcome time frame can extend beyond the intervention period. A twelve-week treatment can include six-month surveys or record review. Mark every outcome that requires a visit, specimen, device, questionnaire, or follow-up contact.
An endpoint is a prespecified measurement used to answer a research question. It does not promise an individual benefit. Ask whether participants receive individual results and when aggregate results may become available.
Worked example: a 12-week intervention with six-month follow-up
Hypothetical record: two randomized groups receive a study intervention or a comparator for 12 weeks. The primary outcome is measured at week 12, while a secondary outcome uses a questionnaire at month six. The overall record says “Recruiting”; the nearby location says “Active, not recruiting.”
The record leaves three separate questions: What is the assignment ratio? Does the six-month measurement require a visit, a call, or record review? Is the nearby site considering new participants despite its listed status? Confirm the answers with the site. Do not schedule travel based on the overall status or treat the intervention period as the full participation period.
Treat eligibility as a summary of protocol rules
Read inclusion and exclusion criteria together. Identify age, diagnosis, disease stage, prior treatment, medication stability, laboratory thresholds, pregnancy and contraception requirements, substance-use restrictions, comorbidities, and recent study participation.
The public entry may condense operational rules. Coordinators cannot waive protocol criteria because a candidate appears close. Ask which facts can be checked before travel and which require consented screening procedures.
Finish with locations, history, and results
Confirm the local facility and location status. Save the central and local contacts when both appear. Open Record History to see what changed. Open the Results tab when results are posted; ClinicalTrials.gov provides a separate guide (opens in a new tab) to participant flow, baseline characteristics, outcome measures, and adverse-event tables.
Sources for this guide
References for the definitions, rules, and findings discussed above. The dates below record source checks; they are separate from the article’s edit date.
- ClinicalTrials.gov. How to Read a Study Record (opens in a new tab). Checked September 5, 2026.
- ClinicalTrials.gov. Glossary Terms (opens in a new tab). Checked September 5, 2026.
- ClinicalTrials.gov. How to Read Study Results (opens in a new tab). Checked September 5, 2026.
- National Institutes of Health. Clinical Research Trials and You: The Basics (opens in a new tab). Checked September 5, 2026.