The ESR Analyzer is used in a clinical lab test that measures the rate at which red blood cells in whole blood descend into a standardized tube, reported as mm per hour. Red blood cells that are inflamed settle more quickly than normal blood cells during this test, which measures inflammation. Thus, a high ESR Analyzer can be indicative of elevated inflammation, though other conditions such as anemia, renal failure, and obesity can increase the ESR rate as well.