Help in diagnosis of Dengue fever (MCQ)


​What is the name if the test where you apply a blood pressure cuff and inflate it to the midpoint between the systolic and diastolic blood pressures for five minutes. and the test is positive for diagnosis of Dengue fever is there are more than 10 to 20 petechiae per square inch?

  • A. Prothrombin time.
  • B. Plasma fibrinogen.
  • C. Tourniquet test.
  • D. Activated partial thromboplastin time.
  • E. Clot retraction.

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Tourniquet test demonstrates capillary abnormality due either to an intrinsic defect in the capillary
walls {capillary fragility] or to some types of thrombocytopenia. The tourniquet test is usually abnormal in immunologic thrombocytopenia such as idiopathic thrombocytopenic purpura (lTP) and drug-induced thrombocytopenia. It produces yariable results, more often normal, in thrombocytopenia of other etiologies. It is usually normal in disorders that do not entail increased capillary fragility or thrombocytopenia, but occasionally it may he abnormal in patients with hemophilia or vitamin K disorders. The test is abnormal in hereditary telangiectasia. The tourniquet test is another procedure that is rarely used today since platelet counts are readily available, but it could be helpful in some instances of nonthrombocytopenic purpura if capillary fragility is suspected


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