These data showed that all three measures may be used as estimators of plasma volume during water deprivation, but only hematocrit may be used for food deprivation or simultaneous food and water deprivation.

Physiology & behavior

Abstract Hematocrit, plasma osmolality, and plasma protein were measured simultaneously with plasma volume in male hooded rats under food, water, or food and water deprivation. All three types of deprivation produced reductions in plasma volume and carcass water. Correlation coefficients and regression equations were calculated for the relationships of the three blood measurements with plasma volume. These data showed that all three measures may be used as estimators of plasma volume during water deprivation, but only hematocrit may be used for food deprivation or simultaneous food and water deprivation.

These data showed that all three measures may be used as estimators of plasma volume during water deprivation, but only hematocrit may be used for food deprivation or simultaneous food and water deprivation.

Hematocrit, plasma osmolality, and plasma protein concentration as estimators of plasma volume in hooded rats during food and water deprivation.