Biomarker
Something measurable in the body used as a signal of what is happening.
Learning
What it means
A biomarker is a measurable characteristic — often from blood, tissue, or imaging — used as an indicator of a biological state or of how a body is responding.
Why it matters if you take part
Some studies only accept people whose biomarkers match a particular pattern, which is why a test may be required before you can join.
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.