A nurse is caring for a postpartum client with a diagnosis of deep vein thrombosis who is receiving a continuous intravenous infusion of heparin sodium

A nurse is caring for a postpartum client with a diagnosis of deep vein thrombosis who is receiving a continuous intravenous infusion of heparin sodium. Which of the following laboratory results will the nurse specifically review to determine whether an effective and appropriate dose of heparin is being delivered?
a) Platelet count
b) Prothrombin time (PT)
c) International normalized ratio (INR)
d) Activated partial thromboplastin time (aPPT).