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The erythrocyte sedimentation rate (ESR), also known as sedimentation rate or "sed rate," is a simple blood test that measures the rate at which red blood cells (erythrocytes) settle to the bottom of a tube in a specific amount of time. Though it may seem archaic compared to modern diagnostic methods, ESR remains a valuable tool in diagnosing and monitoring various inflammatory conditions and diseases.The Principle Behind ESRThe ESR testis based on the principle that when blood is drawn into a narrow tube and left to stand vertically... more