text: The<unk>  <unk>  and its derived measures of<unk>  ratio (PR) and international normalized ratio <unk>  are measures of the extrinsic pathway of coagulation. They are used to determine the clotting tendency of blood, in the measure of warfarin dosage, liver damage and vitamin K status. The reference range for<unk>  is usually around 12-15 seconds; the normal range for the<unk>  is 0.8-1.2.<unk>  measures factors II, V, VII, X and fibrinogen. It is used in conjunction with the activated partial thromboplastin time (aPTT) which measures the intrinsic pathway.
option_0: Prothrombin time
option_1: Activated clotting time
option_2: Partial thromboplastin time
option_3: Fibrin degradation product
option_4: Bleeding time
option_5: Lupus anticoagulant
option_6: FibroTest
option_7: DAPT score