Question

The nurse evaluates the effects of warfarin (Coumadin) by monitoring what laboratory tests?

Select one:
a. Red blood cell count (RBC) and platelets
b. Activated thromboplastin time (APT) and heparin Xa
c. Prothrombin time (PT) and international normalized ratio (INR)
d. Platelet count and potassium level

Answer 1

The effects of warfarin (Coumadin) are evaluated by monitoring Prothrombin time (PT) and the international normalized ratio (INR), which assess the blood's clotting time and provide a standardized measurement for comparison.

Step-by-step explanation:

The nurse evaluates the effects of warfarin (Coumadin) by monitoring two primary laboratory tests: Prothrombin time (PT) and international normalized ratio (INR). The correct answer to the student's question is c. Prothrombin time (PT) and international normalized ratio (INR). These tests are crucial because they measure the time it takes for blood to clot and the ratio is normalized, making it useful for comparison across different laboratories and patient populations. Warfarin's effectiveness is assessed by ensuring the INR is within a therapeutic range, which indicates a proper balance between preventing thrombosis and avoiding excessive bleeding.