Question 74

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

The International Normalized Ratio (INR) is crucial for monitoring the effectiveness and safety of warfarin therapy, as it helps to ensure that the patient's blood coagulation levels are within the therapeutic range.

A) TSH

Thyroid Stimulating Hormone (TSH) levels are primarily used to assess thyroid function and are not directly relevant for monitoring anticoagulation therapy with warfarin. While thyroid dysfunction can influence warfarin metabolism, TSH is not the appropriate lab value to review when entering a warfarin order.

B) INR

The International Normalized Ratio (INR) is the most pertinent laboratory value when managing warfarin therapy. It indicates how well the blood is clotting and helps to adjust the warfarin dosage to maintain the desired anticoagulation effect, making it essential for safe patient management.

C) PTT

Partial Thromboplastin Time (PTT) is a test that measures the time it takes for blood to clot and is typically used to monitor heparin therapy rather than warfarin. While it provides some insights into coagulation, it is not the primary test used for warfarin management, thus making it less relevant in this context.

D) LDH

Lactate Dehydrogenase (LDH) is an enzyme that can indicate tissue damage but does not provide information about coagulation status or the effectiveness of anticoagulation therapy. Therefore, it is not a useful laboratory value for reviewing orders for warfarin.

Conclusion

The INR is the definitive laboratory value for monitoring warfarin therapy, as it directly reflects the anticoagulation status of the patient. Other options, including TSH, PTT, and LDH, do not serve this purpose effectively, confirming that they are not suitable for this specific context.