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ESR for Reactive Arthritis
Erythrocyte Sedimentation Rate (ESR)
An erythrocyte sedimentation rate (ESR) is a measurement of how quickly red blood cells fall to the bottom of a test tube. When swelling and inflammation are present, the blood's proteins clump together and become heavier than normal. Thus, when measured, they fall and settle faster at the bottom of the test tube. Generally, the faster the blood cells fall, the more severe the inflammation.