Hematocrit is also called:

a. White cell count
b. Bone marrow examination
c. Red blood cell (RBC) count
d. Packed red cell volume

ANS: D
Historically the hematocrit was determined by centrifuging an aliquot of anticoagulated whole blood under specified conditions (e.g., centrifugal force, capillary tube length and bore diameter) and then determining the ratio of the space occupied by the packed red cells compared with that of the entire blood volume in the capillary tube, often expressed as a percentage. Hence, it is also called the packed red cell volume.