The hematocrit (Ht or HCT) or packed cell volume (PCV) or erythrocyte volume fraction (EVF)'s the proportion of blood volume that's occupied by red blood cells. It's normally about 46% for men and 38% for women. It's considered an integral part of a person's complete blood count results, along with hemoglobin concentration, white blood cell count, and platelet count. In mammals, hematocrit's independent of body size. The term "hematocrit" (British English: haematocrit) was coined in 1903. Its… (More on Hematocrit)