Hematocrit

**Definition:** The volume of packed RED BLOOD CELLS in a blood specimen. The volume is measured by centrifugation in a tube with graduated markings, or with automated blood cell counters. It is an indicator of erythrocyte status in disease. For example, ANEMIA shows a low value; POLYCYTHEMIA, a high value.

**Tree numbers:** - E01.370.225.625.400 - E05.200.625.400 - G09.188.370.374

**Synonyms:** - Packed Red-Cell Volume - Erythrocyte Volume, Packed