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In the performance of a microhematocrit:

A. Whole coagulated blood must be used.

B. The capillary tube must be completely filled and sealed on one end.

C. The open end of the capillary tube should be sealed with clay before centrifuging.

D. The capillary tubes should be centrifuged in a labeled, sealed Vacutainer tube.

Answer :

Final answer:

The microhematocrit test measures the volume percentage of red blood cells in blood. A capillary tube is used to collect the blood, which is then sealed and centrifuged to separate red blood cells from plasma for analysis.

Explanation:

The question refers to the proper procedure for performing a microhematocrit test, which is a lab technique used to measure the ratio of the volume of red blood cells (erythrocytes) to the total volume of blood. When performing a microhematocrit:

  • B. The capillary tube must be completely filled and sealed on one end.
  • C. The open end of the capillary tube should be sealed with clay before centrifuging.

This process involves collecting a blood sample into a narrow glass tube by capillary action, sealing one end with a clay material, and then spinning the tube in a centrifuge to separate the components of the blood. The heavier red blood cells settle at the bottom of the tube, separating from the lighter plasma, which remains on top. This enables the calculation of the hematocrit value, which is important in diagnosing various medical conditions.

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