We're building a better ClinicalTrials.gov. Check it out and tell us what you think!
Try the New Site
We're building a modernized ClinicalTrials.gov! Visit Beta.ClinicalTrials.gov to try the new functionality.
ClinicalTrials.gov Menu

Crawling This Site

Note: This page is primarily intended for computer programs designed to visit every study available in ClinicalTrials.gov (i.e., web crawlers.) Human users should see the Find Studies section for help with basic and advanced searches for clinical studies.

ClinicalTrials.gov makes it easy for Web crawlers to find all the studies included on the site. Each time a study collection is updated, pages of links to all studies are generated. In addition, ClinicalTrials.gov assigns to each study a unique number, called the ClinicalTrials.gov Identifier (NCT Number), in the format NCTxxxxxxxx, where each "x" is a number.

Use of ClinicalTrials.gov data is subject to these Terms and Conditions. If you Linking to This Site please provide proper attribution to the National Library of Medicine and ClinicalTrials.gov.

Pages of links to all studies, organized by NCT identifier

This page is primarily intended for use by crawlers. A more friendly approach can be found here.

This page last reviewed in May 2014