clinicaltrials_search_studies
Search for clinical trial studies from ClinicalTrials.gov. Supports full-text and field-specific queries, status/phase/geographic filters, pagination, sorting, and field selection. Use the fields parameter to reduce payload size — full study records are ~70KB each.
clinicaltrials_get_study_record
Fetch a single clinical study by NCT ID. Returns the full study record including protocol details, eligibility criteria, outcomes, arms, interventions, contacts, and locations.
clinicaltrials_get_study_count
Get total study count matching a query without fetching study data. Fast and lightweight. Use for quick statistics or to build breakdowns by calling multiple times with different filters (e.g., count by phase, count by status, count recruiting vs completed for a condition).
clinicaltrials_get_field_values
Discover valid values for ClinicalTrials.gov fields with study counts per value. Use to explore available filter options before building a search — e.g., valid OverallStatus, Phase, InterventionType, StudyType, or LeadSponsorClass values.
clinicaltrials_get_field_definitions
Get field definitions from the ClinicalTrials.gov study data model. Returns the field tree with piece names (used in the fields parameter and AREA[] filters), data types, and nesting structure. Call with no path for a top-level overview, then drill into a section with the path parameter to see its fields.
clinicaltrials_get_study_results
Fetch trial results data for completed studies — outcome measures with statistics, adverse events, participant flow, and baseline characteristics. Only available for studies where hasResults is true. Use clinicaltrials_search_studies first to find studies with results.