Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of ESR
Medically reviewed by Min Clinic Staff | Updated: January 2026
ESR: Abbreviation for erythrocyte sedimentation rate, a blood test that detects and monitors inflammation in the body. It measures the rate at which red blood cells (RBCs) in a test tube separate from blood serum over time, becoming sediment in the bottom of the test tube. The sedimentation rate increases with more inflammation. Also commonly called the sed rate.