In anticoagulation management with warfarin, which practice is essential to ensure safe anticoagulation?

• A. Accurate dosing
• B. Regular INR monitoring
• C. Vitamin K intake assessment
• D. Protocol-driven adjustments

Answer: (B)

Regular INR monitoring is essential in warfarin management because the drug has a narrow therapeutic window and its effect can change with diet, illness, or other medicines. The INR provides a measurable gauge of how long blood takes to clot, guiding dose adjustments to keep anticoagulation within the safe, target range. When INR is in range, the risk of clotting is reduced without increasing bleeding risk. If the INR is too high, dose reductions are needed to prevent bleeding; if too low, dose increases are needed to prevent clots. Without regular INR checks, dosing becomes guesswork and safety is compromised, even if dosing decisions seem reasonable. While accurate dosing, vitamin K monitoring, and following protocols matter, none by themselves confirm the current anticoagulation effect—the INR does.