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SummaryWith the use of albumin-I131, the volume of plasma trapped in the packed cell column of hematocrit tubes was determined for blood samples obtained from 5 animal species. The volume of plasma trapped was least in blood samples obtained from elephant, man and dog (MCV 112 to 72 μ3), larger in sheep blood (MCV 37 μ3) and largest in goat blood (MCV 18 μ3). Increasing the force of centrifugation or removal of plasma proteins reduced the volume of fluid trapped in the packed cell column, and the reduction was most pronounced for goat blood.
Chien et al. (Sun,) studied this question.