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Phlebotomy Technician (NCPT) Free Test Prep

Category - Free Phlebotomy Technician Practice Test

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Phil the New Phlebotomy Tech always finds it fascinating to watch blood fill a capillary tube. He marvels at the action involved. What is the action involved in filling a capillary tube?
  1. The force of gravity fills it.
  2. It is filled by capillary action.
  3. It is filled by scooping action.
Explanation
Answer: B - Capillary tubes are manufactured with a very small inner diameter, similar to the dimension found within capillaries. The narrowness of the diameter pulls the blood up (against the force of gravity) into the tube, filling the tube. There is no need to scoop the blood because the capillary tube will fill itself.
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