Which of the following is a critical sign that a nurse must monitor in a client receiving anticoagulation therapy?

Monitoring for bleeding or bruising is critical for a client receiving anticoagulation therapy because these medications are designed to inhibit blood clot formation, which increases the risk of excessive bleeding. Anticoagulants, such as warfarin or heparin, are used in various conditions to prevent thromboembolic events, but they also require careful monitoring to avoid complications.

Signs of bleeding might include visible bruising, petechiae (small red or purple spots), or excessive bleeding from cuts, nosebleeds, and unusual menstrual bleeding. Internally, bleeding might manifest as dark stools or hematuria (blood in urine). Therefore, vigilant observation for any signs of bleeding is essential in preventing serious health issues and ensuring the patient's safety.

In contrast, while changes like increased appetite, improved energy levels, or weight loss are important for overall patient management, they do not constitute immediate health risks or complications associated with anticoagulation therapy. These factors should be noted, but they are not as critical as monitoring for signs of bleeding.