A patient is receiving a continuous I.V. infusion of heparin for the treatment of a pulmonary embolism. Which of the following blood tests should be monitored closely?


•Activated partial thromboplastin time (aPTT) measures the efficacy of the intrinsic coagulation pathway and common coagulation pathway. This measures the effect of heparin on clotting.

•PT and INR are monitored with the use of coumadin (Warfarin).

•PPT does not exist.

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