Blood Clotting Tests Quiz
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Questions and Answers

What is the normal value for Prothrombin Time (PT) using the Whole Blood Method?

  • 15-18 sec.
  • 10-12 sec. (correct)
  • 12-15 sec.
  • 7-10 sec.
  • Why is PT an important test for patients receiving warfarin therapy?

  • To evaluate Extrinsic and Common Pathways (correct)
  • To assess Factor XIII levels
  • To monitor platelet function
  • To measure red blood cell count
  • What does the International Normalized Ratio (INR) measure?

  • Platelet function
  • Hemoglobin levels
  • Sensitivity of the PT reagent (correct)
  • Red blood cell count
  • How does a prolonged PT (>12 sec.) indicate a deficiency?

    <p>Extrinsic and Common Pathway deficiency</p> Signup and view all the answers

    What does ISI stand for in the context of PT reagents?

    <p>International Sensitivity Index</p> Signup and view all the answers

    Why is Factor XIII not detected using both Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT)?

    <p>Because PT and APTT are not sensitive to FXIII deficiency</p> Signup and view all the answers

    What is the primary function of Simplastin in the PT test?

    <p>Replace tissue factor in the thromboplastin</p> Signup and view all the answers

    How does INR relate to the sensitivity of a PT reagent?

    <p>Lower INR indicates higher reagent sensitivity</p> Signup and view all the answers

    Why is it important to compute INR in modern PT tests?

    <p>To standardize PT results across different laboratories</p> Signup and view all the answers

    What is the normal value for Prothrombin Time (PT) using the Capillary Tube Method in minutes?

    <p>7-15 min</p> Signup and view all the answers

    Which of the following is NOT a equipment used in the Extrinsic and Common Pathway Test of Choice?

    <p>microscope slide</p> Signup and view all the answers

    What is the normal INR range as mentioned in the text?

    <p>2.0 - 3.0</p> Signup and view all the answers

    Which component is NOT part of Simplastin reagent for Prothrombin Time (PT) testing?

    <p>heparin</p> Signup and view all the answers

    What does ISI represent in the context of PT reagents?

    <p>International Standardized Index</p> Signup and view all the answers

    Why is Factor XIII deficiency hard to detect using PT and APTT tests?

    <p>Factor XIII deficiency does not affect coagulation times measured by PT and APTT tests</p> Signup and view all the answers

    What happens when the ISI of a PT reagent is closer to 1?

    <p>The reagent becomes more sensitive</p> Signup and view all the answers

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