David Ozeri

1 month ago | health.com | Suchandrima Bhowmik |David Ozeri

Abraham Gonzalez Fernandez / Getty Images The erythrocyte sedimentation rate (ESR) blood test measures how quickly erythrocytes, a type of red blood cell, settle at the bottom of a test tube. It is also known as the sedimentation rate or sed rate test. Red blood cells usually settle slowly, but inflammation causes them to settle more quickly. That means high ESR levels could be a sign of inflammation in your body.