Help in diagnosis of Dengue fever (MCQ)

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