The approximate blood volume in a human can be determined by using:
A) the direct method.
B) the indirect method.
C) a radioisotope.
D) both B and C.

Question

Quizplus · Accepted Answer

The indirect method of determining blood volume involves the injection of a known amount of a substance (such as albumin or Evans blue dye) into the bloodstream and measuring how much remains after it has been thoroughly mixed throughout the plasma volume. The use of a radioisotope, such as technetium-labeled red blood cells, may also be used in this method. Therefore, both options B and C are correct. The direct method, on the other hand, would involve physically measuring the volume of blood in the body, which is not a practical method.

The Approximate Blood Volume in a Human Can Be Determined