ClinicalTrials.gov
Verified by Mdexa · Checked against the source text under public rules.How we check
- Commercial use
- UnclearUnstated
- Derivatives
- Conditional
- Redistribution
- UnclearUnstated
- File on Mdexa
- NoPending
the official terms say the data are free to use but not whether commercial use or redistribution is allowed: unstated, terms present (Article 24)
Cite this pageMdexa, ClinicalTrials.gov, https://mdexa.com/datasets/clinicaltrials-gov/, verified 2026-11-13.
Key facts
- Domain
- Clinical medicine · Pharmacy and drugs Modern medicine
- Content
- RegistriesClinicalTrials.gov contains summary information about clinical studies being conducted throughout the United States and in many countries throughout the world. It is updated daily.
- Size
- —As stated: {"totalStudies":611552,"averageSizeBytes":17327
- Language / modality
- English / Text
- Publisher
- U.S. National Library of Medicine
- Year
- —
- Expert review
- —
- Verification
- Partially verified
Commercial use of ClinicalTrials.gov
Commercial use: Unclear (Unstated). License status: Unstated.
- Conditions
- Attribution, State modifications, Keep current
- Third-party rights
- The source notes that some content may carry third-party rights.
- Terms of use
- The source carries terms of use; they do not state commercial use item by item.
Quoted statements and their sources are in ClinicalTrials.gov license evidence.
Verdicts record what sources state and are not legal advice.
Practical information
Content scope
- The API size statistics report 611552 total studies.
clinicaltrials.gov ·
"totalStudies":611552
https://clinicaltrials.gov/api/v2/stats/size · api-doc · checked 2026-11-13
- The text states that ClinicalTrials.gov contains summary information about clinical studies conducted throughout the United States and in many countries worldwide.
clinicaltrials.gov ·
ClinicalTrials.gov contains summary information about clinical studies being conducted throughout the United States and in many countries throughout the world.
https://clinicaltrials.gov/about-site/terms-conditions · Terms of use page · checked 2026-11-13
Identifiers
- NCT identifierThe statistics list studies under identifiers such as NCT02723955.
clinicaltrials.gov ·
"id":"NCT02723955"
https://clinicaltrials.gov/api/v2/stats/size · api-doc · checked 2026-11-13
Access
- Web APIclinicaltrials.gov JSON
Same terms as the card's license.
- Web APIclinicaltrials.gov
Same terms as the card's license.
Versions
- LatestThere are no numbered data releases; the API's version endpoint reports the dataset posting time (on the check date: dataTimestamp 2026-11-12T10:00:05, API version 2.0.5).
clinicaltrials.gov ·
"dataTimestamp" : "2026-11-12T10:00:05"
https://clinicaltrials.gov/api/v2/version · Dataset page · checked 2026-11-13
- Update cycleThe text states that ClinicalTrials.gov is updated daily.
clinicaltrials.gov ·
ClinicalTrials.gov is updated daily.
https://clinicaltrials.gov/about-site/terms-conditions · Terms of use page · checked 2026-11-13
- Breaking changeThe classic ClinicalTrials.gov website and its API were retired on 25 June 2024.
nlm.nih.gov ·
Effective today, the classic ClinicalTrials.gov website and its application programming interface (API) are retired and no longer available.
https://nlm.nih.gov/pubs/techbull/mj24/mj24_Modern_Clinical_Trials_Website.html · official-change-notice · checked 2026-11-13
Known defects and misuse
- Tse et al.: many records are not updated in time; as of February 2018 about 9.4% of records had 'unknown' recruitment status, meaning not updated or verified for two years.
pmc.ncbi.nlm.nih.gov ·
Despite the capability to make changes to a record, many records are not updated in a timely way.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/ · peer-reviewed-paper · checked 2026-11-13
- Tse et al.: complete, accurate registration and results reporting depend on consistent reporting by sponsors and investigators.
pmc.ncbi.nlm.nih.gov ·
Achieving these goals depends on consistent and systematic reporting by sponsors and investigators.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5968400/ · peer-reviewed-paper · checked 2026-11-13
Suited for
- The text states that the National Institutes of Health developed ClinicalTrials.gov to provide patients, family members, and members of the public with current information about clinical research studies.
clinicaltrials.gov ·
The U.S. National Institutes of Health, Department of Health and Human Services, through its National Library of Medicine, has developed ClinicalTrials.gov to provide patients, family members, and members of the public current information about clinical research studies.
https://clinicaltrials.gov/about-site/terms-conditions · Terms of use page · checked 2026-11-13
ClinicalTrials.gov license evidence 10
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Terms of use pagePage opened
Third-party text · Terms of use page
The following Terms and Conditions apply for use of ClinicalTrials.gov data. Downloading ClinicalTrials.gov data indicates your acceptance of the following Terms and Conditions.
Statement found in snapshot s09 (terms-page)
-
Terms of use pagePage opened
Third-party text · Terms of use page
ClinicalTrials.gov data are available to all requesters, both within and outside the United States, at no charge.
Statement found in snapshot s09 (terms-page)
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Terms of use pagePage opened
Third-party text · Terms of use page
Attribute the source of the data as ClinicalTrials.gov
Statement found in snapshot s09 (terms-page)
-
Terms of use pagePage opened
Third-party text · Terms of use page
You shall not assert any proprietary rights to any portion of the database, or represent the database or any part thereof to anyone as other than a United States Government database.
Statement found in snapshot s09 (terms-page)
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Terms of use pagePage opened
Third-party text · Terms of use page
You shall not use any email addresses extracted from our database for marketing or other promotional purposes.
Statement found in snapshot s09 (terms-page)
-
Terms of use pagePage opened
Third-party text · Terms of use page
The ClinicalTrials.gov data carry an international copyright outside the United States and its Territories or Possessions. Some ClinicalTrials.gov data may be subject to the copyright of third parties; you should consult these entities for any additional terms of use.
Statement found in snapshot s09 (terms-page)
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Terms of use pagePage opened
Third-party text · Terms of use page
Update the data such that they are current at all times
Statement found in snapshot s09 (terms-page)
-
Terms of use pagePage opened
Third-party text · Terms of use page
Clearly display the date the data were processed by ClinicalTrials.gov
Statement found in snapshot s09 (terms-page)
-
Terms of use pagePage opened
Third-party text · Terms of use page
State any modifications made to the content of the data, along with a complete description of the modifications
Statement found in snapshot s09 (terms-page)
-
Terms of use pagePage opened
Third-party text · Terms of use page
These terms and conditions are in effect as long as the user retains any of the data obtained from ClinicalTrials.gov.
Statement found in snapshot s09 (terms-page)
Source and lineage
No upstream or downstream datasets recorded.
Known issues with ClinicalTrials.gov
- No warranties are made and no liability is assumed for use of the data.
- Some data may be subject to third-party copyright; users must consult those parties for additional terms.
- The database is updated daily and users are advised to check frequently for current information.
Preflight
Not run Runs only on ingested data; says nothing about quality.
Downloading ClinicalTrials.gov and API access
No file on Mdexa (see the verdict). Get it from the source and confirm the terms there:
Latest 2026-11-12T10:00:05 · 2026-11-12T10:00:05
Citing ClinicalTrials.gov
Mdexa, ClinicalTrials.gov, https://mdexa.com/datasets/clinicaltrials-gov/, verified 2026-11-13.
More citation details
The source gives no citation text; the line above cites this card.
Machine-readable
clinicaltrials-gov.jsonclinicaltrials-gov.mdcatalog.json
Change log 9
| 2026-11-14 | Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is. | |
| 2026-11-14 | Practical fields (scope, identifiers, access methods, versions, known defects) were added by the automated pipeline from stored page snapshots; every statement carries a verbatim quote. | |
| 2026-11-14 | Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is. | |
| 2026-11-14 | Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is. | |
| 2026-11-14 | Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is. | |
| 2026-11-14 | Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is. | |
| 2026-11-14 | Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is. | |
| 2026-11-13 | Known defects, version notes and access statements from cited sources (papers, release notes, official pages) were added; each shows who said it, when, and what kind of source it is. | |
| 2026-11-13 | Listed on 2026-11-13. Judged by public rules and checked a second time before listing. |
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