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.

Fetch a single clinical trial study by NCT ID from ClinicalTrials.gov. Returns the full study record including protocol details, eligibility criteria, outcomes, arms, interventions, contacts, and locations. Optional locationLimit / outcomeLimit / nearLocation parameters trim locations and outcomes — original totals are preserved in filtersApplied whenever a cap is applied.

Get total clinical trial study count from ClinicalTrials.gov 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).

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.

Resolve valid field names from the ClinicalTrials.gov data model — the canonical PascalCase identifiers (OverallStatus, EnrollmentCount, LeadSponsorName) accepted by the fields, advancedFilter, and sort parameters of other tools, and as input to clinicaltrials_get_field_values. Select a mode: "search" — keyword search returning ranked matches (pass query, e.g. "enrollment", "sponsor", "adverse events"); "drill" — drill into a specific section by dot-notation path (pass path, e.g. "protocolSection.designModule"); "overview" — top-level summary of all sections (no additional args).

Fetch clinical trial results data from ClinicalTrials.gov 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.

Match patient demographics and conditions to eligible recruiting clinical trials. Provide age, sex, conditions, and location to find studies with matching eligibility criteria, contact information, and recruiting locations.