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Definition of Sedimentation rate
1. Noun. The rate at which red blood cells settle out in a tube of blood under standardized conditions; a high rate usually indicates the presence of inflammation.
Medical Definition of Sedimentation rate
1. A sedimentation rate, or sed rate , is a blood test that detects and monitors inflammation activity. It is measured by recording the rate at which red blood cells (rbcs) sediment in a tube over time. It increases (the rbcs sediment faster) with more inflammation. (12 Dec 1998)