Which congenital deficiency(s) is suspected with a normal platelet count, an abnormal PT and APTT, and normal PFA-100 and thrombin time?

Question

Quizplus · Accepted Answer

A normal platelet count rules out platelet disorders. Abnormal PT and APTT suggest deficiencies in the coagulation factors involved in the extrinsic and intrinsic pathways, which are factors VII, X, V, and II (prothrombin). Normal PFA-100 rules out platelet function disorders and normal thrombin time rules out fibrinogen deficiencies. Therefore, the most likely congenital deficiency is in factors VII, X, V, or II (prothrombin).

Which Congenital Deficiency(s) Is Suspected with a Normal Platelet Count