A patient comes with increased aPTT and PT with no bleeding tendency. Even at surgery he did not have increased bleeding. Which factor is deficient-

If both the PT and APTT are prolonged, this indicates either deficiency or inhibition of the final common pathway(which includes factor 5,10,prothrombin and fibrinogen) or global coagulation factor deficiency involving more than one factor, as ocvurs in DIC. Reference : Davidson, 23rd Edition, page no : 921.