Question 74

INR is the laboratory value that would be useful for the pharmacist to review when entering an order for warfarin.

The International Normalized Ratio (INR) is critical for monitoring the anticoagulant effect of warfarin therapy. It helps ensure that patients remain within the therapeutic range to minimize the risk of thromboembolic events or bleeding complications.

A) TSH

Thyroid-Stimulating Hormone (TSH) levels are not directly related to the effectiveness or safety of warfarin therapy. While thyroid function can influence anticoagulation, TSH is not a routine test for monitoring patients on warfarin.

B) INR

INR is the standard laboratory test used to monitor patients on warfarin. It provides a measure of how long it takes for blood to clot compared to a normal range, which is essential for adjusting warfarin dosages to maintain effective anticoagulation.

C) PTT

Partial Thromboplastin Time (PTT) is primarily used to monitor patients on heparin rather than warfarin. While it measures the intrinsic pathway of coagulation, it does not provide relevant information for managing warfarin therapy.

D) LDH

Lactate Dehydrogenase (LDH) is an enzyme that may indicate tissue damage or disease but does not provide any useful information regarding anticoagulation status or the management of warfarin therapy.

Conclusion

The INR is the vital laboratory value for monitoring patients on warfarin, ensuring that their anticoagulation levels are safe and effective. In contrast, TSH, PTT, and LDH do not provide relevant information for warfarin management, making them unsuitable choices in this context.