DescriptionRecruitment—Use this field to specify whether you want to search for studies that are open (recruiting participants) or closed (not recruiting participants). You can select one of the following search options:
- All Studies: All studies, whether or not they are recruiting new participants
- 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:
Not yet recruiting
Available for expanded access
Note: Open studies marked with the word "Unknown" in brown text have a Recruiting or Not yet recruiting status that has not been verified on ClinicalTrials.gov by the sponsor of the study or responsible party within the past 2 years.
- Closed Studies:
Clinical studies that are no longer recruiting participants because they have enough participants already, because they are completed, or because they have been stopped for some reason.
This also describes studies with very specific eligibility criteria that recruit participants by invitation only.
Recruitment statuses for closed studies appear in red text in ClinicalTrials.gov search results and study records. They are:
Active, not recruiting
Enrolling by invitation
Temporarily not available for expanded access
No longer available for expanded access
Approved for marketing
Note: Closed studies marked with the word "Unknown" in brown text have an Active, not recruiting status that has not been verified on ClinicalTrials.gov by the sponsor of the study or responsible party within the past 2 years.
- Exclude Unknown Status: Use this checkbox to remove studies with a recruitment status of Unknown from the search results. A status of Unknown identifies a study on ClinicalTrials.gov with a status of Recruiting; Not yet recruiting; or Active, not recruiting and whose status has not been confirmed by the sponsor of the study or responsible party within the past 2 years. Marking this checkbox on the Advanced Search form is the same as marking the Exclude studies with Unknown status checkbox at the top of the search results list.
See Recruitment Status in the glossary for the definitions of each status.