Medical Definition of ESR

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.

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Last Editorial Review: 5/13/2016

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