Practical guide · reviewed 2026-08-17
How to find a clinical trial (without getting lost in protocol-speak)
A step-by-step way to search recruiting studies on ClinicalTrials.gov and PlainTrials, then confirm eligibility with the study team. Not medical advice.
Start with the official registry
ClinicalTrials.gov is the US public registry for most interventional studies that enroll in the United States, and it also lists many international sites. If a study is recruiting in the US, it should have an NCT number (for example NCT01234567). That identifier is the primary key on PlainTrials. We do not invent studies.
Search by condition, drug name, or city. Then open the record and check Overall Status. “Recruiting” means the sponsor told the registry they are looking for participants. It does not guarantee a slot at the site nearest you.
Use a plain-English layer, then go back to the NCT page
PlainTrials rewrites the public fields (title, summary, phase, inclusion/exclusion) so you can scan faster. Every card keeps a hyperlink to the official NCT record. If our sentence and the registry disagree, the registry wins.
Do not stop on a rewrite. The protocol, consent form, and site staff decide what happens next.
Filter on what actually changes eligibility
The details that most often include or exclude people are: diagnosis and stage, prior treatments, age, lab windows, pregnancy, other medicines, and whether you can travel to a listed site. Those live in Eligibility Criteria on ClinicalTrials.gov.
Phase (1–4) describes the usual purpose of a drug study. It is not a score of how good the treatment is. Observational studies may have no drug phase at all.
Contact the study, not a search engine
Use the central contact or site contact published on the NCT record. Say the NCT number first. Ask whether the site is still recruiting, what visits look like, and whether your clinician should send records.
If you are in a medical emergency, call local emergency services. A trials website cannot triage you.