Heparin therapy is monitored by which of the following?

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Multiple Choice

Heparin therapy is monitored by which of the following?

The effect of unfractionated heparin is best tracked by tests that reflect its impact on the intrinsic and common coagulation pathways, or by directly measuring heparin activity. The activated partial thromboplastin time (aPTT) is the classic test: heparin prolongs the intrinsic pathway, so the aPTT is used to adjust dosing to a therapeutic range. In many settings, especially with LMWH or when the aPTT is unreliable, an anti-Xa activity assay is used because it directly measures the amount of heparin in the blood. PT/INR evaluates the extrinsic pathway and is used to monitor warfarin therapy, not heparin. Platelet count is important for detecting heparin-induced thrombocytopenia (HIT), a potential adverse reaction, but it does not measure anticoagulant effect. D-dimer reflects fibrin degradation and is useful for diagnosing thrombosis, not for monitoring heparin therapy. So the monitoring approaches for heparin are aPTT and anti-Xa activity.

The effect of unfractionated heparin is best tracked by tests that reflect its impact on the intrinsic and common coagulation pathways, or by directly measuring heparin activity. The activated partial thromboplastin time (aPTT) is the classic test: heparin prolongs the intrinsic pathway, so the aPTT is used to adjust dosing to a therapeutic range. In many settings, especially with LMWH or when the aPTT is unreliable, an anti-Xa activity assay is used because it directly measures the amount of heparin in the blood.

PT/INR evaluates the extrinsic pathway and is used to monitor warfarin therapy, not heparin. Platelet count is important for detecting heparin-induced thrombocytopenia (HIT), a potential adverse reaction, but it does not measure anticoagulant effect. D-dimer reflects fibrin degradation and is useful for diagnosing thrombosis, not for monitoring heparin therapy.

So the monitoring approaches for heparin are aPTT and anti-Xa activity.

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