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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.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=16829
Last Editorial Review: 10/9/2012

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