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Sed rate, or erythrocyte sedimentation rate (ESR), is a blood test that can reveal inflammatory activity in your body. A sed rate test isn't a stand-alone diagnostic tool, but it may help your doctor diagnose or monitor the progress of an inflammatory disease.
Purpose of the test. The sedimentation rate blood test measures how quickly red blood cells settle in a test tube. A sedimentation rate test is done to: - Find out if inflammation is present. - Check on the progress of a disease. - See how well a treatment is working.