is_about blood cell leukemia congenital heart disease acquired polycythemia vera vitamin B12 deficiency hemorrhage folate deficiency blood component anemia (phenotype) hematocrit true packed red-cell volume MESH:D006400 Dani Welter 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. http://www.nlm.nih.gov/medlineplus/ency/article/003646.htm packed erythrocyte volume Ht MedDRA:10019422 hematological measurement