A nurse is teaching a client who has diabetes mellitus and receives 25 units of NPH insulin every morning if her blood glucose level is above 200mg/dL. Which of the following information should the nurse include?

A. Anticipate the NPH insulin to peak in 6 to 14 hr: NPH insulin is an intermediate-acting insulin that typically peaks within 6 to 14 hours after administration. This is the correct time frame and important for patient teaching regarding hypoglycemia risk. B. Anticipate the NPH insulin to peak 1-2 hr: A 1–2 hour peak corresponds to rapid-acting insulins such as lispro or aspart, not NPH. Teaching this would mislead the client about when to monitor closely for low blood sugar. C. Anticipate the NPH insulin to peak 18-24 hrs: This timing reflects the duration of action of long-acting insulins like glargine, which do not have a pronounced peak. NPH does not peak this late. D. Anticipate the NPH to peak 30min-1hr: A 30–60 minute peak corresponds to short-acting regular insulin, not NPH. Giving this timeframe would cause inaccurate monitoring and increase risk for hypoglycemia unawareness.