What is esr: The erythrocyte sedimentation rate (ESR)

The erythrocyte sedimentation rate (ESR) test is a blood test that can reveal inflammation in the body. A high or low result may signify an underlying condition, such as rheumatoid arthritis or ... ESR is a blood test that measures inflammation in the body. Learn about the causes, symptoms, and tips for managing high ESR levels, and how to get tested for inflammatory conditions. An ESR (erythrocyte sedimentation rate test) is a blood test that helps detect inflammation. Learn what the results mean. What is ESR (Erythrocyte Sedimentation Rate)? The esr test measures the velocity of red blood cells settling in the bottom of a test tube, as it is one of the key ways the esr measures inflammation . An accelerated rate can be an indication of inflammation in the body.