Phlebotomy Technician Practice Exam (NCPT/CPT)

Question: 1 / 400

What percentage of separated blood in a tube is RBC?

5%

10%

RBC or red blood cells, also known as erythrocytes, make up approximately 40-45% of the total volume of blood. Therefore, options A, C, and D, which are lower than 40%, are incorrect. Option B, which is 10%, is the most accurate estimation of the percentage of separated blood in a tube composed of mostly RBC.

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15%

20%

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