Clinical trial registry search
Search ClinicalTrials.gov only: NCT IDs, sponsor-entered status, study dates and source links. One successful free search per browser.
Search public records
One successful free search per page. Selecting records, viewing evidence and re-downloading are free. Copy or download before leaving; results are not transferred to AnswerThis.
Continue investigating the evidence
Copy or download your results first. Signup opens the AnswerThis app and does not transfer this result set.
How to use this finder
- Choose the integrated source that fits your research question and jurisdiction.
- Enter public, de-identified research terms, review the filters and confirm the attestation.
- Search once, then inspect record identity, source dates and the official links.
- Copy or download your result set; open publisher portals for complete documents and current status.
Sources reviewed: 14 September 2026. Service scope: ClinicalTrials.gov API v2. This editorial date describes the source-scope review; individual result retrieval and source dates are shown separately.
Integrated providers: ClinicalTrials.gov. Official portal links are identified separately. No AI model generates or rewrites these search results.
Example search
Research topic
diabetes
What to inspect
Official identifier, source agency, jurisdiction, version or as-of date, retrieval time and official link.
Load example fills only the topic. Confirm the de-identification checkbox yourself before searching.
Search the registry that fits your question
ClinicalTrials.gov is an international registry hosted by the US National Library of Medicine. This page searches its documented v2 service and returns up to ten records, with an official link for every NCT identifier. Start with a condition, an intervention or a distinctive study term. The optional filters let you narrow the condition and intervention separately, restrict overall recruitment status, choose a phase and name a country. Country filtering concerns listed study locations; it does not establish that a site is currently enrolling or accepting people from another country.
A broad disease query is useful for orientation, but it can include studies with different designs, interventions and populations. A phase filter can exclude observational research or trials for which phase is not applicable. Try the example diabetes query to see how an identifier, a sponsor and a record update travel together. The displayed count is the size of this bounded result set, not the number of eligible trials in a systematic review. Refine the search on the official registry if you need a complete, reproducible export.
This finder searches the US-hosted ClinicalTrials.gov registry only. It does not search a separate European registry or combine records across registries. ClinicalTrials.gov itself includes international study locations; use the country filter when your question concerns a particular location. Coverage here describes the data source, not a guarantee that every trial in a country is registered there.
Read sponsor-entered records carefully
Registry entries are supplied by sponsors or investigators. An NCT number establishes a record identity, not an endorsement by NIH, NLM or FDA. Overall status, planned enrollment, eligibility language and outcomes can change. The displayed record last-update date helps you judge freshness, while the retrieval timestamp records when this page obtained the information. These dates answer different questions. A record retrieved today can still contain information that the responsible party last updated months ago.
Check the study title, sponsor, design, intervention and countries together before treating a result as the trial you intended. A short acronym or similar title can refer to several protocols. The locations count describes sites listed in the retrieved record; it is not a count of open appointments. Start, primary-completion and completion dates can represent planned or actual milestones. Read the official record for the date type and the fuller protocol context before using any milestone in a research timeline.
The sponsor-entered summary is shown as source material. It is not rewritten into a medical recommendation, and it does not establish whether a person qualifies for enrollment. Do not enter patient histories, contact details or confidential recruitment information. Use public research terms and follow the official study contact process if you need to ask about participation.
For example, an estimated completion in December and a record update in June are study and record dates. A September retrieval only records when this search read that entry; it does not convert the estimate into an actual milestone.
Keep the record identity with your evidence
Copy or download the result set while it is visible. Each exported entry retains its identifier, official URL, source, countries, version availability, source date and retrieval time. Preserve these fields when making a trial landscape or evidence table. If an official record changes later, the timestamp explains the scope of your earlier search; it does not turn the downloaded text into a permanently current registry record.
For evidence synthesis, compare registry outcomes and dates with publications, protocols and posted results. A registration can help identify planned outcomes or ongoing studies, but the existence of a registry entry does not establish that results were reported or that an intervention works. Do not count a publication and its linked registration as two independent studies. Record the relationship explicitly and investigate disagreements in status, enrollment or outcome definitions at the source.
Frequently asked questions
Is an NCT number an endorsement?
No. It identifies a sponsor-entered registry record. It does not establish effectiveness, recruitment eligibility or government endorsement.
Does this search EU trials?
No — only ClinicalTrials.gov. EU trials are on the CTIS portal.
What does the locations count mean?
It counts locations supplied in the retrieved registry record. It does not confirm that every location is actively recruiting.
Why might a phase filter remove relevant studies?
Phase is not applicable to every study design. Remove the filter when you need observational studies or other research without a drug-development phase.
Can I enter participant information?
No. Enter only de-identified public research topics or identifiers and confirm the attestation before searching.
How many free searches can I run?
This tool includes 1 successful free run per browser. Failed requests and copying or downloading an existing result do not use another run. Empty searches, opening records and viewing their evidence are also free.
What happens when I sign up?
Signup opens the AnswerThis app. It does not unlock more runs on this page or transfer your draft. Copy or download your result first.
Source policies
ClinicalTrials.gov terms. Check the original publisher’s reuse terms for each portal document; an integrated-provider policy does not grant rights to other publishers’ content.