ClinicalTrials.gov
ClinicalTrials.gov is a public clinical study registry website for searching trial records, eligibility criteria, locations, study sponsors, results, and NCT identifiers.
What ClinicalTrials.gov is
ClinicalTrials.gov is a public clinical study registry website at clinicaltrials.gov for finding information about research studies involving human participants. It is run by the U.S. National Library of Medicine at the National Institutes of Health and is used by patients, caregivers, clinicians, researchers, sponsors, regulators, journalists, and the public.
Study records
A study record can describe the condition being studied, intervention or exposure, study design, sponsor, collaborators, enrollment target, eligibility criteria, recruitment status, locations, contacts, dates, outcome measures, and a ClinicalTrials.gov identifier called an NCT number. The record is a structured summary, not the full medical protocol.
Search and filters
The search tools help users look for studies by condition, keyword, location, intervention, age, sex, recruitment status, and other fields. Searching well often means trying both patient-friendly words and medical terms, then reading eligibility criteria carefully before assuming a study is relevant.
Results database
Some records include summary results for completed or terminated studies. Results entries can list participant flow, baseline characteristics, outcome measures, adverse events, and statistical information, depending on what was required and submitted. Posted results are useful for transparency, but they still need careful interpretation.
Patients and caregivers
For people considering a study, the site is a starting point for questions, not a replacement for medical advice. Trial participation can involve eligibility screening, benefits, burdens, privacy issues, travel, randomization, placebo controls, side effects, and informed consent, so decisions should be discussed with qualified health professionals and study staff.
Research and reporting
Clinical researchers, institutions, sponsors, reviewers, and analysts use the registry to submit records, monitor study status, check reporting obligations, link publications to NCT identifiers, and compare research activity across conditions or interventions. The website also provides API and download resources for structured reuse of study data.
Strengths and limits
ClinicalTrials.gov is valuable because it makes many clinical studies visible in one place, but it is not a complete list of all research and it does not certify that a study is safe, ethical, effective, or appropriate for a specific person. Records can also be incomplete, outdated, or written in technical language.
Why it matters
Clinical trial registries matter because medical evidence should be findable before, during, and after a study. Public records can help people discover research opportunities, reduce hidden or selectively reported studies, support oversight, and give researchers a shared reference point for trial identifiers and outcomes.
WHOIS domain data
Data pulled: June 1, 2026View current WHOIS record
- Domain
- clinicaltrials.gov
- IP address
- 34.107.134.59
- Registrar
- get.gov
- WHOIS server
- whois.nic.gov
- Referral URL
- https://get.gov
- Created
- February 3, 2000
- Updated
- August 23, 2025
- Expires
- August 18, 2026
- Nameservers
- ns-cloud-d1.googledomains.com (216.239.32.109); ns-cloud-d2.googledomains.com (216.239.34.109); ns-cloud-d3.googledomains.com (216.239.36.109); ns-cloud-d4.googledomains.com (216.239.38.109)
- Domain status
- serverTransferProhibited
- Contact privacy
- Registrant, administrative, and technical contact details are redacted for privacy in the Who.is record.