What percentage of whole blood is plasma?

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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 plasma?

Explanation:
Blood is made up of plasma—the liquid portion that carries cells and dissolved substances—and formed elements (red cells, white cells, platelets). In a healthy person, plasma accounts for about 55% of blood, while formed elements make up roughly 45%. This 55% matches how hematocrit values place red blood cells at about 45% of blood volume, leaving the rest as plasma. Plasma is mostly water (about 92%) with proteins and other solutes making up the remaining ~8%. So the correct percentage is about 55%.

Blood is made up of plasma—the liquid portion that carries cells and dissolved substances—and formed elements (red cells, white cells, platelets). In a healthy person, plasma accounts for about 55% of blood, while formed elements make up roughly 45%. This 55% matches how hematocrit values place red blood cells at about 45% of blood volume, leaving the rest as plasma. Plasma is mostly water (about 92%) with proteins and other solutes making up the remaining ~8%. So the correct percentage is about 55%.

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