Phlebotomy Technician Practice Exam (NCPT/CPT)

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Prepare effectively for the NCPT/CPT Phlebotomy Technician Exam. Utilize flashcards and multiple-choice questions with hints and explanations to excel in your exam.

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What percentage of separated blood in a tube is RBC?

  1. 5%

  2. 10%

  3. 15%

  4. 20%

The correct answer is: 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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