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Comprehensive and Detailed Explanation:

The International Normalized Ratio (INR) is used to monitor the anticoagulant effect of warfarin. Maintaining INR within the target therapeutic range helps balance the risk of thrombosis against the risk of bleeding. Warfarin has a narrow therapeutic index and is affected by numerous drug interactions, dietary factors, and patient-specific variables. Consequently, regular INR monitoring is essential. Serum potassium, bilirubin, and amylase are useful laboratory tests inother clinical situations but are not the primary monitoring parameters for warfarin therapy. Pharmacists play a significant role in anticoagulation management by reviewing drug interactions, educating patients, and helping ensure safe and effective therapy. Anticoagulation principles are emphasized in the FPGEE blueprint because they represent important aspects of cardiovascular pharmacotherapy and patient safety.