Final answer:
A measure of RBC mass can be determined by hematocrit (HCT), the actual red blood cell (RBC) count, and hemoglobin (HGB) levels. Thus, all of these tests, collectively, provide information on the RBC mass in the blood.
Step-by-step explanation:
The measure of red blood cell (RBC) mass can be determined using several parameters:
- HCT or hematocrit is a measure of the percentage of erythrocytes in a blood sample after it has been centrifuged.
- RBC count, which measures the actual number of red blood cells in a given volume of blood.
- HGB or hemoglobin, which is the oxygen-carrying compound in erythrocytes.
Therefore, the correct option is D) All of the above as all these tests reflect aspects of the RBC mass in the blood.