Answer: Today's NCLEX Question of the Day

✅ Answer: B) aPTT Rationale: The aPTT (activated partial thromboplastin time) is the lab used to monitor and titrate an IV heparin infusion, and the dose is adjusted per the facility's protocol. PT/INR (A) monitors warfarin. Platelets (C) are also checked during heparin therapy to watch for heparin-induced thrombocytopenia, but they don't tell you whether the dose is therapeutic. H&H (D) helps detect bleeding but doesn't measure anticoagulation. Memory tip: heparin goes with PTT, warfarin goes with PT/INR. Protamine sulfate is the antidote for heparin.