Blood Clotting Time Procedure
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Questions and Answers

What is the normal range for clot retraction?

  • 70-80%
  • 48-64% (correct)
  • 30-45%
  • 55-70%
  • What is the computation formula for platelet estimate?

  • Cells/uL = Average no.of platelets x 10,000
  • Cells/uL = Average no.of platelets x 20,000 (correct)
  • Cells/uL = Average no.of platelets x 30,000
  • Cells/uL = Average no.of platelets x 5,000
  • Which method of determining clotting time has less contamination of plasma with tissue fluids?

  • Plain capillary tube method
  • Lee and White Method
  • Skin puncture wound method
  • Sabraze's Coagulation time using capillary tubes (correct)
  • What is the objective of Platelet Estimate mentioned in the text?

    <p>Platelet count determination</p> Signup and view all the answers

    Which temperature is mentioned for placing the tube in the water bath during clotting?

    <p>37°C</p> Signup and view all the answers

    What is the average volume of serum expressed as a percentage of the original volume of whole blood after clotting?

    <p>55%</p> Signup and view all the answers

    Which component is bound by sodium citrate in the whole blood to prevent anticoagulation?

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

    What is the first step in the capillary method of clotting time?

    <p>Disinfect the area of puncture</p> Signup and view all the answers

    What is the normal capillary clotting time in the slide or drop method?

    <p>2-4 minutes</p> Signup and view all the answers

    In the capillary method of clotting time, when should the timer be started?

    <p>As soon as the second drop of blood appears</p> Signup and view all the answers

    Which method uses a clean slide and is considered the simplest among all clotting time methods?

    <p>Slide or Drop Method</p> Signup and view all the answers

    What does the plasma contain after centrifugation in Prothrombin Time (PT) - Quick Method?

    <p>Intrinsic coagulation factors except calcium and platelets</p> Signup and view all the answers

    Which pathway of hemostasis does the prothrombin time (PT) evaluate?

    <p>Extrinsic and common pathways</p> Signup and view all the answers

    What is the purpose of adding calcium, phospholipids, and an activator to plasma in the clotting process?

    <p>To activate factor VII</p> Signup and view all the answers

    What initiates the activation of factor VII in the clotting process?

    <p>Tissue extract (Factors III)</p> Signup and view all the answers

    Which test is used as a means for measuring the effect of anticoagulants, especially coumarin?

    <p>Prothrombin time (PT)</p> Signup and view all the answers

    What converts fibrinogen into fibrin during the clotting process?

    <p>Activated thrombin</p> Signup and view all the answers

    Which factors is the PT test dependent upon for monitoring anticoagulant therapy?

    <p>I, II, V, VII, and X</p> Signup and view all the answers

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