Each ClinicalTrials.gov record presents summary information about a study protocol and includes the following:
- Disease or condition
- Intervention (for example, the medical product, behavior, or procedure being studied)
- Title, description, and design of the study
- Requirements for participation (eligibility criteria)
- Locations where the study is being conducted
- Contact information for the study locations
- Links to relevant information on other health Web sites, such as NLM's MedlinePlus® for patient health information and PubMed® for citations and abstracts of scholarly articles in the field of medicine
Some records also include information on the results of the study, such as:
- Description of study participants (the number of participants starting and completing the study and their demographic data)
- Outcomes of the study
- Summary of adverse events experienced by study participants
The full history of the changes made to a record can be accessed by viewing the archival version of the record on the ClinicalTrials.gov archive. Once a study is registered on the site, the information about it is not removed.