Clinicaltrials Search Studies
clinicaltrials_search_studiesRead-onlyIdempotent
Search for clinical trial studies from ClinicalTrials.gov. Supports full-text and field-specific queries, status/phase/geographic filters, pagination, sorting, and field selection. Returns a compact per-study index by default; pass the fields parameter to get specific leaves at full fidelity — full study records are ~70KB each.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| sort | No | Sort order. Format: FieldName:asc or FieldName:desc. E.g., "LastUpdatePostDate:desc", "EnrollmentCount:desc". Max 2 fields comma-separated. For "largest trials" queries, pair EnrollmentCount:desc with advancedFilter "AREA[StudyType]INTERVENTIONAL" — the top enrollment counts are observational registry/claims studies enrolling tens of millions. Enrollment counts are sponsor-reported and not validated upstream beyond the unknown-enrollment sentinel exclusion. Use clinicaltrials_get_field_definitions to find sortable field names. | |
| query | No | General free-text search across all fields. Runs the 57-field relevance search ClinicalTrials.gov publishes for this parameter — NCTId, NCTIdAlias, OrgStudyId, SecondaryId, Acronym, BriefTitle, OfficialTitle, Condition, InterventionName, InterventionOtherName, Phase, StdAge, StudyType, BriefSummary, outcome measures and their descriptions, LeadSponsorName, CollaboratorName, the Location* fields, the Design* fields, and the ConditionAncestorTerm/InterventionAncestorTerm MeSH umbrellas — so a hit need not carry your term in the field you had in mind. Plain words plus AND, OR, NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression — those work here as well as in advancedFilter, so AREA[Phase]PHASE2 is accepted in this parameter; a stray bracket fails. `( )` group sub-expressions and work when matched; `,` acts as AND. The dedicated *Query parameters (conditionQuery, interventionQuery, etc.) scope a search to one field. | |
| fields | No | PascalCase leaf names to return; strongly recommended since full records are ~70KB. Omit for the compact index projection — an empty list is rejected, not treated as omission. Common leaves: NCTId, BriefTitle, BriefSummary, OverallStatus, Phase, LeadSponsorName, Condition. Call clinicaltrials_get_field_definitions with a concept query (e.g., "adverse events", "eligibility") to find the exact leaf for any concept. | |
| nctIds | No | Filter to specific NCT IDs for batch lookups. Omit to search every study — an empty list is rejected, not treated as "no filter". Supplying this lifts the default unknown-enrollment exclusion, so an ID you name is never filtered out of its own lookup. | |
| pageSize | No | Results per page, 1–200. | |
| geoFilter | No | Geographic proximity filter. Format: distance(lat,lon,radius), where radius carries a `mi` or `km` suffix — e.g. "distance(47.6062,-122.3321,50mi)" for studies within 50 miles of Seattle. Always include the suffix: a bare radius is accepted upstream but interpreted as meters, which silently matches almost nothing. When set, each study's locations are re-sorted by proximity to the center so the nearest matched site leads, annotated with its distance in miles; the full location list is preserved. | |
| pageToken | No | Pagination cursor from a previous response. | |
| countTotal | No | Include total study count in response. Only computed on the first page. | |
| titleQuery | No | Search within study titles and acronyms only. Matches Acronym, BriefTitle, and OfficialTitle. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND. | |
| phaseFilter | No | Filter by trial phase. Omit to search all phases — an empty list is rejected, not treated as "no filter". Values: EARLY_PHASE1, PHASE1, PHASE2, PHASE3, PHASE4, NA. | |
| outcomeQuery | No | Search within outcome measure fields. Matches PrimaryOutcomeMeasure, SecondaryOutcomeMeasure, OtherOutcomeMeasure, and OutcomeMeasureTitle, plus their description counterparts PrimaryOutcomeDescription, SecondaryOutcomeDescription, OtherOutcomeDescription, OutcomeMeasureDescription, and OutcomeMeasurePopulationDescription — so a term appearing only in outcome prose still matches. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND. | |
| sponsorQuery | No | Sponsor/collaborator name search. Matches LeadSponsorName, CollaboratorName, and OrgFullName. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND. | |
| statusFilter | No | Filter by study status. Omit to search all statuses — an empty list is rejected, not treated as "no filter". Values: RECRUITING, COMPLETED, ACTIVE_NOT_RECRUITING, NOT_YET_RECRUITING, ENROLLING_BY_INVITATION, SUSPENDED, TERMINATED, WITHDRAWN, UNKNOWN, WITHHELD, NO_LONGER_AVAILABLE, AVAILABLE, APPROVED_FOR_MARKETING, TEMPORARILY_NOT_AVAILABLE. | |
| locationQuery | No | Location search — city, state, country, or facility name. Matches LocationCity, LocationState, LocationCountry, LocationFacility, and LocationZip; a study matches when any of its sites does. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND. | |
| advancedFilter | No | Advanced filter using AREA[FieldName]value syntax. Examples: "AREA[StudyType]INTERVENTIONAL", "AREA[EnrollmentCount]RANGE[100, 1000]", "AREA[Phase]PHASE2 AND AREA[StudyType]INTERVENTIONAL", "(AREA[Phase]PHASE3 OR AREA[Phase]PHASE4) AND AREA[StudyType]INTERVENTIONAL". AND/OR/NOT join complete AREA[FieldName]value expressions; parentheses group them. Call clinicaltrials_get_field_definitions to find AREA[]-compatible field names. | |
| conditionQuery | No | Condition/disease-specific search. E.g., "Type 2 Diabetes", "non-small cell lung cancer". Matches Condition, BriefTitle, OfficialTitle, ConditionMeshTerm, ConditionAncestorTerm, Keyword, and NCTId. ConditionAncestorTerm is the MeSH umbrella above the conditions a study itself lists, so results run broader than those lists — a study can match a parent term it never names. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND. | |
| interventionQuery | No | Intervention/treatment search. E.g., "pembrolizumab", "cognitive behavioral therapy". Matches InterventionName, InterventionType, ArmGroupType, InterventionOtherName, BriefTitle, OfficialTitle, ArmGroupLabel, InterventionMeshTerm, Keyword, InterventionAncestorTerm, InterventionDescription, and ArmGroupDescription. InterventionAncestorTerm is the MeSH umbrella above the interventions a study itself lists, so results run broader than those lists. Plain words plus AND/OR/NOT. `[ ]` are valid only inside an AREA[FieldName]value or RANGE[min, max] expression, which this parameter accepts; a stray bracket fails. `( )` group sub-expressions when matched; `,` acts as AND. | |
| includeUnknownEnrollment | No | Include studies whose EnrollmentCount is the upstream "unknown" sentinel (99999999). Excluded by default — the sentinel pollutes RANGE[N, MAX] queries and EnrollmentCount:desc sorts. Set true for data-quality audits or when targeting unknown-enrollment studies specifically. |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| error | No | Present when the call failed. Absent on success. | |
| notice | No | Recovery guidance when no studies matched — echoes the constraint and suggests how to broaden. Absent on pages with results. | |
| studies | No | Matching studies. By default each entry is a COMPACT index projection — nctId, briefTitle, overallStatus, phases, enrollmentCount, leadSponsor, conditions, and a bounded locations summary ({ total, nearest }) — mirroring the rendered result, NOT the full ~70KB record. Pass the fields parameter to receive exactly the requested leaves at full fidelity instead (e.g. all locations). Fetch a full single record with clinicaltrials_get_study_record. | |
| totalCount | No | Total matching studies (first page only when countTotal=true). | |
| nextPageToken | No | Token for the next page. Absent when this response already carries every matching study; otherwise it mirrors the upstream cursor, which ClinicalTrials.gov emits whenever a page fills to pageSize — so on a continuation page a token can still lead to an empty page. | |
| searchCriteria | No | Echo of active query/filter criteria applied to this search, including sentinelFilterActive when the default unknown-enrollment exclusion is in effect. Present on every response. | |
| requestedFields | No | Echo of the explicit fields parameter — present only when the caller passed fields. Signals that studies carry the requested leaves at full fidelity (not the default compact index) and that the rendered truncation cap is lifted so all of them appear. |