The nurse is planning a class about blood glucose monitoring for a group of clients with diabetes mellitus. Which timing of glucose testing would apply for any client regardless of the client's age or type of diabetes?

A. Before going to bed: Bedtime glucose checks may be recommended for some clients, especially those on insulin, but this timing is individualized. It is not universally required for every client with diabetes. B. During acute illness: Any client with diabetes, regardless of age or type, should monitor glucose closely during acute illness. Illness can cause stress-induced hyperglycemia or unpredictable fluctuations, requiring more frequent testing to guide management. C. Prior to exercising: Checking glucose before exercise is important for clients at risk of hypoglycemia, especially those using insulin or certain oral agents. However, this is not necessary for all clients, particularly those with type 2 diabetes controlled by diet alone. D. Immediately after meals: Postprandial monitoring is useful in some cases to evaluate mealtime insulin effectiveness or dietary impact, but it is not universally recommended for every diabetic client. Its use depends on individualized treatment plans.