What percentage of whole blood is composed of cells?

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Study for the NHCO Phlebotomy Test. Experience flashcards and multiple-choice questions with hints and explanations. Prepare effectively for your phlebotomy exam!

Multiple Choice

What percentage of whole blood is composed of cells?

Explanation:
Blood is made up of plasma and formed elements (the cells). Plasma is the liquid portion and accounts for about 55% of blood, while the formed elements—the red blood cells, white blood cells, and platelets—make up roughly 45%. Since the question asks for the percentage of whole blood that is composed of cells, the correct value is the cellular fraction, about 45%. Red blood cells comprise the majority of this cellular component, with white blood cells and platelets contributing only a small amount to the total. The other options correspond to plasma (55%), or are not representative of the overall cellular fraction in typical conditions.

Blood is made up of plasma and formed elements (the cells). Plasma is the liquid portion and accounts for about 55% of blood, while the formed elements—the red blood cells, white blood cells, and platelets—make up roughly 45%. Since the question asks for the percentage of whole blood that is composed of cells, the correct value is the cellular fraction, about 45%. Red blood cells comprise the majority of this cellular component, with white blood cells and platelets contributing only a small amount to the total. The other options correspond to plasma (55%), or are not representative of the overall cellular fraction in typical conditions.

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