The total blood volume may be calculated by dividing the measured red cell volume by the?

The total blood volume can be accurately calculated by dividing the measured red cell volume by the corrected hematocrit. The corrected hematocrit takes into account the volume of red blood cells in connection to the overall blood volume, providing a more precise measure. The hematocrit itself represents the ratio of the volume of red blood cells to the total blood volume, but using the corrected value helps to adjust for variables that can affect accuracy, such as plasma volume variations.

In this context, plasmacrit is specifically the volume fraction of plasma in the blood but is not used in calculating total blood volume. The number of red blood cells from a hemocytometer does not directly correspond to the volume measurements needed for calculating blood volume. Using corrected hematocrit ensures that all physiological variables are factored into the calculation, leading to a more accurate representation of total blood volume in the body.