This is the classic website, which will be retired eventually. Please visit the modernized instead.
Working… Menu

Crawling This Site

Note: This page is primarily intended for computer programs designed to visit every study available in (i.e., web crawlers.) Human users should see the Find Studies section for help with basic and advanced searches for clinical studies. 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, assigns to each study a unique number, called the Identifier (NCT Number), in the format NCTxxxxxxxx, where each "x" is a number.

Use of 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

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