A 10 year old boy presents with mucosal bleeding of 1 week duration. The investigation of choice that will be most useful in him is –
Bleeding from mucosal surface suggests thrombocytopenia or defect in platelet function.
First do platelet count, if there is thrombocytopenia, further investigation will be required.
Prothrombin time
Clotting time
Partial thromboplastin time
Platelet count