<prompt> Extrinsic pathway of coagulation is tested by?PTCTaPTTBT  <response>: Simple tricks to remember questions of hemostasis:Intrinsic pathway XII XI IX X Help of VIII, IVExtrinsic pathway III VII XCommon pathway X II I fibrin plug help of V, XIIIVitamin K dependent clotting factors - 2, 7, 9, 10 protein C and S - mainly extrinsic pathwayVitamin K antagonists - Coumarin derivatives dicoumarol and warfarin 