Questions: 51. The blood test that provides an overall view about the composition of the blood is a(an): A. CBC. B. Hgb. C. Hct. D. PCV.

The answer is the first one (A): CBC.

Explanation for each option:

A. CBC (Complete Blood Count): This is the correct answer. A CBC is a comprehensive blood test that evaluates the overall composition of the blood. It measures several components, including red blood cells, white blood cells, hemoglobin, hematocrit, and platelets, providing a broad overview of a person's blood health.

B. Hgb (Hemoglobin): This test measures the amount of hemoglobin in the blood, which is important for carrying oxygen. However, it does not provide a complete overview of the blood's composition.

C. Hct (Hematocrit): This test measures the proportion of blood volume that is occupied by red blood cells. While it is an important component of blood analysis, it does not provide a full picture of the blood's composition.

D. PCV (Packed Cell Volume): This is another term for hematocrit and measures the volume percentage of red blood cells in blood. Like hematocrit, it does not provide a comprehensive view of the blood's overall composition.

In summary, the CBC is the test that provides an overall view of the blood's composition, making it the correct choice.