The proportion of blood occupied by red blood cells, usually expressed as a percentage of the total blood volume. It is determined by centrifuging heparinized blood in a capillary tube (a microhematocrit tube) at 10,000 RPM for five minutes to separate the blood into layers.
An average (normal) value in men is 46% and in women is 38%.
Synonym: hematocrit, erythrocyte volume fraction (EVF).
Packed cell volume