Also called surrogate biomarker · biological marker
A biomarker is a measurable biological characteristic used as an indicator of normal or pathological processes, or of response to treatment. Examples: HbA1c for diabetes management, IGF-1 for GH-axis activity, VEGF levels for angiogenic activity. Biomarkers may serve as surrogate endpoints in trials when the true clinical endpoint would take too long to measure.
Research use only. This definition is an educational reference, not medical advice or dosing guidance.