A service of the U.S. National Institutes of Health

Glossary Definition

OPEN STUDIES

Studies that are currently recruiting participants, will be recruiting participants in the future, or involve drugs that are available for expanded access. Recruitment statuses for open studies appear in green text in ClinicalTrials.gov search results and study records. These are:

Recruiting
Not yet recruiting
Available for expanded access

Note: For open studies, the word "Unknown," in brown text, means that a study record with a Recruiting or Not yet recruiting status has not been verified in ClinicalTrials.gov within the past 2 years. (See LAST VERIFIED DATE.)