# Estimate the range for the percent of blood volume that is comprised of red blood cells (hematocrit HCT) in human adults (both male and female separately) from the following:The number of red blood...

Estimate the range for the percent of blood volume that is comprised of red blood cells (hematocrit HCT) in human adults (both male and female separately) from the following:

The number of red blood cells per volume of blood (known as the RBC
count) in healthy, human adults ranges from 4.7 to 6.1 million cells per
microliter for males, and from 4.2 to 5.4 million cells per microliter for females. Assume that, on average, the volume of a red blood cell is about
8.5*10^-11 cm^3.

justaguide | Certified Educator

The number of red blood cells in human males lies in the the range 4.7 to 6.1 million cells per micro-liter for males. The volume of a red blood cell is approximately 8.5*10^-11 cm^3 or 8.5*10^-14 l. The volume of all the red blood cells in blood is in the range 4.7*10^6*8.5*10^-14*10^6 = 39.95% to 6.1*10^6*8.5*10^-14*10^6 = 51.85%

For females the RBC count is 4.2 to 5.4 million cells per micro-liter. This gives a hematocrit (HCT) of 4.2*10^6*8.5*10^-14*10^6 = 35.7% to 5.4*10^6*8.5*10^-14*10^6 = 45.9%

The hematocrit (HCT) for males is in the range 39.95% to 51.85% and for females it is in the range 35.7% to 45.9%