Platelet Function Analyzer (PFA) - Clot Retraction
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Questions and Answers

Which of the following is necessary for normal clot retraction?

  • Low levels of ATP
  • Low levels of calcium (correct)
  • Low levels of fibrinogen
  • Low levels of platelets
  • In thrombocythemia, what is abnormal in terms of clot retraction?

  • Calcium levels
  • Platelet function (correct)
  • Fibrinogen levels
  • ATP levels
  • What is the purpose of the Hirscboeck method in platelet function analysis?

  • To observe clot retraction (correct)
  • To measure closure time
  • To assess platelet adherence
  • To detect abnormal fibrinogen levels
  • What does the Steffani method aim to inspect in whole blood?

    <p>Clot retractility</p> Signup and view all the answers

    In the Mac Farlane method, what is measured after incubating whole blood?

    <p>% of serum left after retraction</p> Signup and view all the answers

    What parameter is measured in the Cartidges used in platelet function analysis?

    <p>Closure time</p> Signup and view all the answers

    Which of the following is an aggregating agent used in platelet lumi-aggregometry?

    <p>Thrombin receptor activating peptide (TRAP)</p> Signup and view all the answers

    What is the ratio of specimen to anticoagulant in platelet lumi-aggregometry?

    <p>9:1</p> Signup and view all the answers

    Which syndrome is NOT associated with abnormal platelet function?

    <p>Rumple Leed syndrome</p> Signup and view all the answers

    In platelet lumi-aggregometry, what is measured simultaneously with platelet aggregation?

    <p>Secretion of adenosine triphosphate (ATP)</p> Signup and view all the answers

    Which of the following is NOT an agonist used in aggregometry systems that measure only aggregation?

    <p>Arachidonic acid</p> Signup and view all the answers

    What is the visual method of choice for performing a manual platelet count according to the text?

    <p>Phase-contrast microscope</p> Signup and view all the answers

    What is the diameter of the suction cup used in the Hess test for counting petechiae?

    <p>2cm</p> Signup and view all the answers

    What is the minimum number of petechiae per 1 square inch considered a positive result in the tourniquet test?

    <p>10</p> Signup and view all the answers

    Which method uses monoclonal antibodies to platelet-specific targets for platelet enumeration?

    <p>RBC/platelet ratio method</p> Signup and view all the answers

    What is the diluting fluid used for leukocyte cell count according to the text?

    <p>Weak acid</p> Signup and view all the answers

    Which test employs a suction cup on the upper arm at 200-250 torr pressure to count petechiae?

    <p>Hess test</p> Signup and view all the answers

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