PCV Lab 4 Quiz
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Questions and Answers

What is the normal range of hematocrit for adult males?

  • 37-47%
  • 18-25%
  • 42-52% (correct)
  • 36-44%

    • Which of the following conditions is associated with an increase in PCV?

  • Pregnancy
  • Lung disease (correct)
  • Anemia
  • Kidney disease

    • What is the purpose of centrifuging the capillary tube containing the blood sample?

  • To separate the red blood cells from the plasma (correct)
  • To sterilize the blood sample
  • To measure the volume of the blood sample
  • To mix the blood sample thoroughly

    • What is the role of a hematocrit reader in the PCV test?

    <p>To determine the percentage of red blood cells in the sample (B)</p> Signup and view all the answers

    What is the main purpose of the PCV test?

    <p>To diagnose anemia and polycythemia (D)</p> Signup and view all the answers

    A patient presents with a PCV of 25%. Which of the following conditions is most likely to be present?

    <p>Anemia (A)</p> Signup and view all the answers

    A patient with a history of kidney disease may have a low PCV due to:

    <p>Decreased red blood cell production (A)</p> Signup and view all the answers

    Which of the following is NOT a reason for an increased PCV?

    <p>Low in minerals like iron (D)</p> Signup and view all the answers

    What is the significance of the hematocrit reader in the PCV test?

    <p>It measures the percentage of red blood cells in the whole blood sample (D)</p> Signup and view all the answers

    If a patient has a PCV of 30%, what is the most likely cause of this?

    <p>Anemia (D)</p> Signup and view all the answers

    Which of the following conditions would most likely result in a decrease in PCV?

    <p>Kidney disease (D)</p> Signup and view all the answers

    A patient presents with a PCV of 55%. Which of the following is the most likely cause?

    <p>Polycythemia (C)</p> Signup and view all the answers

    Which of the following is NOT a step involved in the PCV test procedure?

    <p>Analyzing the blood sample under a microscope (A)</p> Signup and view all the answers

    What is the purpose of centrifuging the capillary tube during the PCV test?

    <p>To separate the red blood cells from the plasma (C)</p> Signup and view all the answers

    A patient's PCV is measured at 35%. This result likely indicates that the patient is:

    <p>Healthy (C)</p> Signup and view all the answers

    A patient with iron deficiency anemia is likely to have a(n) _____.

    <p>Decreased PCV (D)</p> Signup and view all the answers

    Which of the following conditions does NOT typically result in an increased PCV?

    <p>Pregnancy (D)</p> Signup and view all the answers

    Which of these is a valid reason for using a sterile lancet when collecting a blood sample for PCV?

    <p>To prevent contamination of the blood sample (A)</p> Signup and view all the answers

    In the context of the PCV test, what is the primary purpose of centrifuging the blood sample?

    <p>To separate the red blood cells from the plasma (D)</p> Signup and view all the answers

    Why is it important to fill the hematocrit tube to ¾ its length before centrifuging?

    <p>To provide enough blood sample for accurate reading (D)</p> Signup and view all the answers

    A doctor suspects a patient has polycythemia. Which of the following steps would be LEAST useful in confirming their diagnosis?

    <p>Checking the patient's blood pressure (A)</p> Signup and view all the answers

    A patient presents with a PCV of 20%. Which of the following could be a likely explanation for this result?

    <p>Iron deficiency anemia (B)</p> Signup and view all the answers

    A doctor suspects a patient has polycythemia. What is the expected PCV value for this patient?

    <p>Higher than 52% (D)</p> Signup and view all the answers

    Which of the following scenarios would NOT lead to an increased PCV?

    <p>A patient with iron deficiency anemia (D)</p> Signup and view all the answers

    Why is it crucial to clean the finger with spirit before obtaining a blood sample for the PCV test?

    <p>To minimize the risk of infection (C)</p> Signup and view all the answers

    What is the PRIMARY purpose of centrifuging the blood sample in a capillary tube during the PCV test?

    <p>To separate the red blood cells from the plasma (C)</p> Signup and view all the answers

    A patient's PCV value is found to be within the normal range. This indicates that the patient most likely has:

    <p>Normal red blood cell count (C)</p> Signup and view all the answers

    Which of the following conditions is LEAST likely to contribute to an increased PCV?

    <p>Iron deficiency anemia (A)</p> Signup and view all the answers

    Flashcards

    Packed Cell Volume (PCV)

    A measure of the relative percentage of red blood cells in whole blood.

    Purpose of PCV Testing

    Used to diagnose anemia and polycythemia in patients.

    PCV Normal Values for Adults

    Normal PCV is 37-47% for females and 42-52% for males.

    PCV Increase Causes

    Can increase due to polycythemia, dehydration, lung disease, or certain heart diseases.

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    PCV Decrease Causes

    Causes include pregnancy, anemia, low iron, and kidney diseases.

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    PCV procedure steps

    Steps to measure packed cell volume from blood sample.

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    Hematocrit reader

    Device used to determine packed cell volume after centrifugation.

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    Symptoms of low PCV

    Signs include fatigue, weakness, and pale skin due to anemia.

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    Conditions causing increased PCV

    Polycythemia, dehydration, lung disease, and heart disease can raise PCV.

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    Normal PCV values for children

    Normal packed cell volume for children ranges from 36% to 44%.

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    Testing PCV Purpose

    To diagnose anemia and polycythemia.

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    Normal PCV Range for Children

    Normal packed cell volume is 36-44% for children.

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    PCV Increase Related Conditions

    PCV increases in polycythemia, dehydration, and some lung diseases.

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    PCV Decrease Related Conditions

    PCV decreases in pregnancy, anemia, and kidney diseases.

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    Hematocrit Capillary Tube

    A tool used to collect blood for PCV measurement.

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    Centrifuge Purpose in PCV

    Separates blood components to measure PCV accurately.

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    Sealing Material Role

    Used to secure capillary tubes after blood collection.

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    Centrifuge Role

    A device that spins samples to separate blood components for PCV measurement.

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    Normal PCV Range for Females

    The typical packed cell volume for adult females, which is 37-47%.

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    Normal PCV Range for Males

    The typical packed cell volume for adult males, which is 42-52%.

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    PCV Decrease Conditions

    Situations where PCV is lower, including pregnancy and anemia.

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    PCV Increase Conditions

    Scenarios where PCV is higher, such as polycythemia and dehydration.

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    Centrifuge Speed for PCV

    Speed of 11000 rpm is used during centrifugation for PCV.

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    PCV Testing Procedure

    Steps include blood collection, sealing, centrifuging, and measurement.

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    PCV Measurement Purpose

    To assess the percentage of red blood cells in blood samples.

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    Factors Causing High PCV

    Can be high due to dehydration and lung or heart diseases.

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    Factors Causing Low PCV

    May decrease due to anemia or kidney diseases and low iron.

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    Normal PCV Values for Adults

    Typical PCV: 37-47% for females, 42-52% for males.

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    Study Notes

    Packed Cell Volume (PCV) Lab 4

    • PCV is the relative percentage of red blood cells in a given volume of whole blood
    • Used to diagnose anemia (low red blood cells) and polycythemia (high red blood cells)
    • Part of a complete blood count (CBC)

    Materials

    • Good blood sample
    • Hematocrit capillary tube
    • Sealing material (e.g., clay)
    • Micro centrifuge
    • Hematocrit reader
    • Sterile lancet

    Procedure

    • Clean finger with spirit, use sterile lancet for deep prick
    • Fill capillary tube with blood to ¾ its length
    • Seal the tube cap
    • Centrifuge for 4-5 minutes at 11,000 rpm
    • Determine PCV using hematocrit reader

    Normal Values

    • Adult females: 37-47%
    • Adult males: 42-52%
    • Children: 36-44%

    Increased PCV

    • Polycythemia
    • Dehydration
    • Lung disease
    • Some heart diseases

    Decreased PCV

    • Pregnancy
    • Anemia
    • Low iron levels
    • Kidney diseases

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    Related Documents

    PCV Packed Cell Volume PDF

    Description

    Test your knowledge on the Packed Cell Volume (PCV) and its significance in diagnosing conditions such as anemia and polycythemia. This quiz covers the procedure, normal values, and factors affecting PCV. Brush up on your lab skills and understanding of complete blood counts!

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