A client is receiving orlistat as part of a weight management program. Which ongoing assessment should be included in the plan of care to determine the effectiveness of the medication?

A. Serum protein levels: While protein status is important in overall nutrition, orlistat works by reducing fat absorption rather than protein absorption. Monitoring serum proteins would not directly evaluate the drug’s effectiveness in promoting weight loss. B. Daily calorie count: Tracking calorie intake supports weight management, but it reflects dietary compliance rather than the medication’s specific effect. Orlistat effectiveness is better measured by changes in body composition and weight over time. C. Body mass index (BMI): BMI provides a standardized measure of weight relative to height and is a key indicator of weight loss progress. Tracking BMI over time offers a clear, quantifiable way to assess the effectiveness of orlistat in achieving weight reduction goals. D. Depression screening: While depression screening is important in holistic care, especially for clients in weight management programs, it does not measure the pharmacologic effectiveness of orlistat. It addresses emotional well-being rather than physical weight loss.