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ClinicalTrials.gov

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clinicaltrials.gov

Registered clinical studies worldwide: conditions, interventions, sponsors, locations and results.

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Capabilities (9)

GET /v1/data/clinicaltrials/enums1 credit

Returns every enumerated type in the study model with its legal values and the legacy label for each.

No parameters
GET /v1/data/clinicaltrials/fieldsizes1 credit

Returns, for a list-valued field, how many studies have 1, 2, 3 ... entries in it, with the minimum, maximum and unique size counts.

fields
GET /v1/data/clinicaltrials/fieldvalues1 credit

Returns the distribution of values for a field across the whole registry: unique value count, how many studies are missing it, and the top values with study counts.

fieldstypes?
GET /v1/data/clinicaltrials/metadata1 credit

Returns the full ClinicalTrials.gov data dictionary: every field in the study model with its name, piece name, type, nesting and a link to the definition.

includeIndexedOnly?includeHistoricOnly?
GET /v1/data/clinicaltrials/searchareas1 credit

Returns the named search areas the query.* parameters map onto, listing which underlying fields each one covers and how they are weighted.

No parameters
GET /v1/data/clinicaltrials/size1 credit

Returns the total number of registered studies and the distribution of study record sizes in bytes, with percentiles and the largest studies named.

No parameters
GET /v1/data/clinicaltrials/studies1 credit

Returns matching ClinicalTrials.gov study records with the full protocol section - title, status, phase, conditions, interventions, eligibility, outcomes, sponsors and facility locations - plus a page token and the total match count.

query.cond?query.term?query.intr?query.locn?query.titles?query.outc?query.spons?query.lead?query.id?query.patient?filter.overallStatus?filter.geo?filter.ids?filter.advanced?postFilter.overallStatus?postFilter.geo?aggFilters?sort?fields?pageSize?pageToken?countTotal?
GET /v1/data/clinicaltrials/study1 credit

Returns one complete study record by NCT number: protocol section, results section when posted, derived annotations and the document section.

nctfields?markupFormat?
GET /v1/data/clinicaltrials/version1 credit

Returns the API version string and the timestamp of the most recent data refresh.

No parameters

Licence

A work of the United States Government, not subject to domestic copyright under 17 U.S.C. 105, published by the agency as open data.

https://clinicaltrials.gov/about-site/terms-conditions

Attribution

Display this wherever you show the data. It arrives on every response as provenance.attribution_text.

Source: ClinicalTrials.gov

Cache: up to 3600s

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