Hematocrit Measurement Methods
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Questions and Answers

What is the principle behind the microhematocrit method for determining hematocrit?

  • Analyzing blood using a colorimeter
  • Measuring blood pressure in capillaries
  • Mixing blood with anticoagulants
  • Spinning a blood-filled capillary tube in a centrifuge (correct)
  • Which of the following conditions can lead to an increased hematocrit result?

  • High altitudes (correct)
  • Pregnancy
  • Dehydration (correct)
  • Anemia
  • Which instrument is used in the microhematocrit method to measure packed cell volume?

  • Centrifuge scale
  • Hemoglobinometer
  • Microhematocrit reader (correct)
  • Blood pressure monitor
  • What is the recommended RPM and time setting for centrifuging the capillary tubes in the microhematocrit method?

    <p>10,000 rpm for 5 minutes</p> Signup and view all the answers

    Which step is crucial to avoid falsely low hematocrit results in the microhematocrit method?

    <p>Completely sealing the capillary tubes</p> Signup and view all the answers

    What is the expected hematocrit reading when the bottom margin of the red cell layer is against the O mark?

    <p>It cannot be determined without the plasma layer position</p> Signup and view all the answers

    Which materials are required for performing the microhematocrit method?

    <p>Anticoagulant, capillary tubes, wax sealant, reader</p> Signup and view all the answers

    What common misconception might lead a student to incorrectly conduct the microhematocrit test?

    <p>Choosing an incorrect sealing method</p> Signup and view all the answers

    Study Notes

    Hematocrit Overview

    • Hematocrit (Packed Cell Volume, PCV) measures the proportion of blood volume occupied by red blood cells.
    • Determined through two methods: macro-method (Wintrobe's) and micro-method (microhematocrit).

    Microhematocrit Method

    • Principle: Blood-filled capillary tubes are spun in a centrifuge to separate components.
    • Hematocrit measurement can also be obtained via Coulter counter analyzers.

    Required Materials

    • Capillary tubes (75 mm, plain)
    • Microhematocrit centrifuge
    • Microhematocrit reader
    • Hematocrit tube sealant (e.g., plasticine, sealing wax)

    Procedure for Sample Collection

    • Use capillary or venous blood collected in an anticoagulated EDTA tube, or directly collected blood.

    Step-by-Step Procedure

    • Gently mix the blood 5 times to ensure uniformity.
    • Fill capillary tubes to 2/3 full with blood, ideally using two tubes per sample.
    • Seal one end of each tube and place them in the centrifuge.
    • Centrifuge at 10,000 rpm for 5 minutes to separate the blood components.
    • Insert the tube into the microhematocrit scale/reader for measurement.
    • Align the scale so the bottom margin of red cell layer meets the O mark, and the top margin of plasma layer meets the 100 mark.
    • Adjust the sliding line to accurately cut between the red cell layer and the buffy coat.
    • Record the reading as the PCV percentage.

    Conditions Affecting Results

    • Decrease in hematocrit may indicate:
      • Anemia
      • Pregnancy
    • Increase in hematocrit may be seen in:
      • Newborns
      • Burn patients
      • Individuals at high altitudes
      • Dehydration

    Normal Values/Range

    • Standard hematocrit values vary but specific ranges are not detailed in the notes.

    Precautions

    • Ensure complete sealing of capillary tubes to prevent falsely low hematocrit results.

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    Related Documents

    Hematocrit Procedure PDF

    Description

    This quiz explores the principles and methods of hematocrit measurement, focusing on the macro-method, specifically Wintrobe's method, and the micro-method using a microhematocrit centrifuge. It discusses the necessary materials and instruments involved in these techniques.

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