Still have questions?
Our FAQ section has answers to commonly asked questions and a glossary of words to know.
Trial reference number
The ClinicalTrials.gov identifer is an identification number that the website ClinicalTrials.gov assigns to a trial when it is registered. The trial identifer number is in the format “NCTXXXXXXXX”. The trial is not registered until a trial identifer number is assigned.
Trial name
The official title of a clinical trial. Sometimes a trial also has a short title written in language that is easier for the public to understand.
Trial purpose
The main reason for the clinical trial. The primary purpose types include treatment, prevention, diagnostic, quality of life (supportive care), screening, and others.
Eligibility
A clinical trial’s requirements (criteria) for people who want to join. Eligibility criteria consists of:
- Inclusion criteria, which are factors (such as age, race, sex, or condition) that allow a person to join a trial
- Exclusion criteria, which are factors or conditions that are not permitted in a trial
About the trial/trial design
The research methods and strategies used in the clinical trial.
Trial phases
The phase of the clinical trial, which is a number 1 through 4. The phase is based on the trial’s goals, the number of participants, and other characteristics.
Learn more about the 4 clinical trial phases
Trial dates
The start date is the actual date on which the first participant was enrolled in a clinical trial. The “estimated” start date is the date that the researchers think the trial will start.
