{nctId}: Get a specific study by NCT ID

API: clinicaltrials.gov:clinicaltrials.gov-api
Endpoint: /studies/{nctId}
Response format: application/json
Auth: none
Method: GET
Last Status: 200
Latency: 226ms

Description

Retrieve complete, detailed information about a specific clinical trial using its NCT ID (National Clinical Trial identifier). Returns the full study record including all protocol information (title, description, design, eligibility criteria), status history, sponsor and investigator details, conditions being studied, interventions being tested, outcome measures, locations where the trial is conducted, and contact information. Use this endpoint when you already know the specific trial you want details for - typically after finding it via the search endpoint. The response is comprehensive (500KB+) and includes everything known about the trial including results data if available.

From spec: Retrieve detailed information about a specific clinical study using its unique NCT identifier.

Usage Tips

- The NCT ID is case-insensitive but must be valid format (starts with NCT followed by 8 digits) - Response is very large (500KB+) - be prepared to handle big JSON payloads - Study may include resultsSection if results have been submitted - Use this after finding trials via /studies search, not for discovery - Consider caching results since study data changes infrequently - The hasResults flag indicates whether results data is available

Parameters (2)

fields (string, query, optional)

Comma-separated list of fields to include in the response

nctId (string, path, required)

The NCT ID (e.g., NCT05194917)

Constraints: {'pattern': '^NCT\\d+$'}

Examples (7)

Get trial by NCT ID openapi-spec

Retrieve detailed information for a specific clinical trial by its NCT ID.

curl 'https://clinicaltrials.gov/api/v2/studies/NCT00000102'

import requests

resp = requests.get("https://clinicaltrials.gov/api/v2/studies/NCT00000102")
data = resp.json()

import zingu_apis

api = zingu_apis.api("clinicaltrials")
result = api.fetch("studies/{nctId}")

for item in result:
    print(item)

const resp = await fetch("https://clinicaltrials.gov/api/v2/studies/NCT00000102");
const data = await resp.json();

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Get study by NCT ID - COVID-19 vaccine trial curl

Retrieve detailed information for a clinical trial (COVID-19 vaccine trial).

curl 'https://clinicaltrials.gov/api/v2/studies/NCT04470427'

import requests

resp = requests.get("https://clinicaltrials.gov/api/v2/studies/NCT04470427")
data = resp.json()

import zingu_apis

api = zingu_apis.api("clinicaltrials")
result = api.fetch("studies/{nctId}")

for item in result:
    print(item)

const resp = await fetch("https://clinicaltrials.gov/api/v2/studies/NCT04470427");
const data = await resp.json();

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Get study by NCT ID - Alzheimer's disease study curl

Retrieve detailed information for a clinical trial (Alzheimer's disease study).

curl 'https://clinicaltrials.gov/api/v2/studies/NCT02565511'

import requests

resp = requests.get("https://clinicaltrials.gov/api/v2/studies/NCT02565511")
data = resp.json()

import zingu_apis

api = zingu_apis.api("clinicaltrials")
result = api.fetch("studies/{nctId}")

for item in result:
    print(item)

const resp = await fetch("https://clinicaltrials.gov/api/v2/studies/NCT02565511");
const data = await resp.json();

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Get study by NCT ID - Cancer immunotherapy trial curl

Retrieve detailed information for a clinical trial (Cancer immunotherapy trial).

curl 'https://clinicaltrials.gov/api/v2/studies/NCT03789097'

import requests

resp = requests.get("https://clinicaltrials.gov/api/v2/studies/NCT03789097")
data = resp.json()

import zingu_apis

api = zingu_apis.api("clinicaltrials")
result = api.fetch("studies/{nctId}")

for item in result:
    print(item)

const resp = await fetch("https://clinicaltrials.gov/api/v2/studies/NCT03789097");
const data = await resp.json();

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Get study by NCT ID openapi-spec

Retrieve detailed information for a clinical trial (specific NCT ID lookup).

curl 'https://clinicaltrials.gov/api/v2/studies/NCT00281983'

import requests

resp = requests.get("https://clinicaltrials.gov/api/v2/studies/NCT00281983")
data = resp.json()

import zingu_apis

api = zingu_apis.api("clinicaltrials")
result = api.fetch("studies/{nctId}")

for item in result:
    print(item)

const resp = await fetch("https://clinicaltrials.gov/api/v2/studies/NCT00281983");
const data = await resp.json();

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Get a specific clinical study openapi-spec

curl 'https://clinicaltrials.gov/api/v2/studies/NCT01901835?fields=NCTId%2CBriefTitle%2CCondition'

import requests

resp = requests.get(
    "https://clinicaltrials.gov/api/v2/studies/NCT01901835",
    params={
        'fields': 'NCTId,BriefTitle,Condition',
    },
)
data = resp.json()

import zingu_apis

api = zingu_apis.api("clinicaltrials")
result = api.fetch("studies/{nctId}", fields="NCTId,BriefTitle,Condition")

for item in result:
    print(item)

const resp = await fetch("https://clinicaltrials.gov/api/v2/studies/NCT01901835?fields=NCTId%2CBriefTitle%2CCondition");
const data = await resp.json();

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Get a specific clinical study probe-gate

curl 'https://clinicaltrials.gov/api/v2/studies/NCT01901835?fields=NCTId%2CBriefTitle%2CCondition'

import requests

resp = requests.get(
    "https://clinicaltrials.gov/api/v2/studies/NCT01901835",
    params={
        'fields': 'NCTId,BriefTitle,Condition',
    },
)
data = resp.json()

import zingu_apis

api = zingu_apis.api("clinicaltrials")
result = api.fetch("studies/{nctId}", fields="NCTId,BriefTitle,Condition")

for item in result:
    print(item)

const resp = await fetch("https://clinicaltrials.gov/api/v2/studies/NCT01901835?fields=NCTId%2CBriefTitle%2CCondition");
const data = await resp.json();

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Probe History

Latency

Status Codes

Time	Status	Latency
2026-04-16 17:32:57.977205	200	226ms
2026-04-16 03:59:06.211319	200	204ms
2026-04-16 03:39:43.343924	200	200ms
2026-04-16 03:04:35.542649	200	216ms
2026-04-16 02:48:48.874607	200	197ms
2026-04-16 01:54:09.314962	200	264ms
2026-04-16 01:19:55.953543	200	201ms
2026-04-16 01:13:14.599665	200	200ms
2026-04-15 03:04:23.637592	200	230ms
2026-04-15 02:52:55.333649	200	205ms
2026-04-15 02:46:27.850439	200	212ms
2026-04-15 01:57:54.797422	200	226ms
2026-04-15 01:03:43.783295	200	251ms
2026-04-15 00:56:39.338785	200	214ms
2026-04-15 00:04:01.979478	200	208ms
2026-04-14 03:54:18.144082	200	214ms
2026-04-14 03:44:03.199785	200	252ms
2026-04-14 02:33:24.959431	200	214ms
2026-04-14 01:42:37.086566	200	279ms
2026-04-14 00:56:49.748042	200	199ms
2026-04-14 00:28:53.541153	200	220ms
2026-04-14 00:06:18.984006	200	911ms
2026-04-12 16:21:52.131111	200	259ms
2026-04-12 15:34:07.745022	200	190ms
2026-04-12 15:31:57.386307	200	193ms
2026-04-12 15:16:56.011433	200	196ms
2026-04-12 15:15:54.402519	200	183ms
2026-04-12 14:48:26.706510	200	239ms
2026-04-12 13:27:01.211935	200	183ms
2026-04-10 04:29:02.527679	200	184ms
2026-04-10 03:49:30.315133	ERR	—
2026-04-10 03:16:14.928992	200	173ms
2026-04-10 02:26:48.706374	200	184ms
2026-04-10 01:39:27.355052	200	792ms
2026-04-10 00:47:33.444948	200	190ms
2026-04-10 00:46:30.692414	200	176ms
2026-04-09 03:39:19.998608	200	200ms
2026-04-09 03:35:41.841075	200	203ms
2026-04-09 02:21:37.946646	200	186ms
2026-04-09 01:55:50.322467	200	329ms
2026-04-09 00:53:49.496238	200	207ms
2026-04-09 00:42:10.770722	200	387ms
2026-04-09 00:38:18.622393	200	485ms
2026-04-08 07:37:16.278560	200	207ms
2026-04-08 07:31:36.068414	200	207ms
2026-04-08 07:01:14.338516	200	303ms
2026-04-08 01:36:45.859805	200	262ms
2026-04-08 00:25:49.747304	200	196ms
2026-04-08 00:19:47.017357	200	199ms
2026-04-08 00:09:52.224053	200	266ms