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 monitoring serum protein levels can be important for overall nutritional status, it is not a direct measure of the effectiveness of orlistat in weight management. B) Body mass index (BMI): BMI is a key indicator of weight status and helps assess the effectiveness of orlistat as part of a weight management program. Tracking changes in BMI over time provides a clear measure of weight loss or maintenance. C) Daily calorie count: Although monitoring caloric intake is useful for overall dietary management, it does not specifically measure the effectiveness of orlistat. The medication's primary function is to inhibit fat absorption, which ultimately influences weight. D) Depression screening: While mental health is important in weight management, depression screening is not a direct measure of the effectiveness of orlistat. This assessment should be considered, but it is secondary to tracking changes in BMI.