Enrolment
The number of participants a study plans to include, or has included.
Learning
What it means
Enrolment is the count of participants. Registry records usually give an estimated target while a study is recruiting, and an actual figure once it closes.
Why it matters if you take part
It indicates the scale of the study. Small enrolment is normal for early-phase studies and is not a defect.
Related terms
This explains how clinical research works. It is not medical advice and does not describe any specific condition or treatment. Only a trial site can determine whether someone can take part in a study.