The nurse is caring for a client receiving IV heparin therapy for a pulmonary embolism. Which lab values would the nurse expect to order on this client?

Number 3 is correct.

PT, PTT, and INR are blood tests that monitor effectiveness of anticoagulant therapy. Hematocrit measures packed red blood cells and is not a specific study of anticoagulant effectiveness. HDL and LDL are components of cholesterol measurement. Troponin levels measure myocardial muscle injury.