Which test measures the concentration of white blood cells, red blood cells, and platelets in the blood?

• A. BNP
• B. Complete Blood Count
• C. Creatinine
• D. Blood Urea Nitrogen

Answer: (B)

Measuring the concentration of white blood cells, red blood cells, and platelets is what a Complete Blood Count provides. This test is designed to quantify the three main blood cell types and also reports related information like hemoglobin and hematocrit, giving a snapshot of overall blood health. It helps detect anemia (low red blood cells or hemoglobin), infections or immune issues (abnormal white blood cells), and problems with clotting (platelet abnormalities), making it a versatile tool for evaluating many conditions at once.

The other options don’t assess these cell counts. BNP looks at a heart-related peptide used to evaluate heart failure, not blood cell numbers. Creatinine measures kidney function and muscle mass, while blood urea nitrogen reflects kidney function and protein metabolism. So, the test that directly measures the concentrations of white blood cells, red blood cells, and platelets is the Complete Blood Count.