A client with diabetes mellitus who is newly diagnosed and learning to self-inject NPH should be aware of the peak action timing. The time window to watch is between which two times?

A client with diabetes mellitus who is newly diagnosed and learning to self-inject NPH should be aware of the peak action timing. The time window to watch is between which two times?

• A. 7:30 am and 9:30 am
• B. 1:30 pm and 7:30 pm
• C. 8:30 pm and 12:00 am
• D. 2:30 am and 4:30 am

Answer: (B)

The key idea is when NPH insulin acts most strongly. NPH is an intermediate-acting insulin with onset in about 1–2 hours and a peak effect roughly 6–12 hours after a dose. If the dose is given in the morning, the peak action falls in the afternoon to early evening. So the window to watch for the strongest insulin effect — and the highest risk of hypoglycemia — is roughly mid‑afternoon to early evening, about 1:30 pm to 7:30 pm. The other time ranges would miss the typical peak period for a morning NPH dose, making them less relevant for monitoring peak action.

The key idea is when NPH insulin acts most strongly. NPH is an intermediate-acting insulin with onset in about 1–2 hours and a peak effect roughly 6–12 hours after a dose. If the dose is given in the morning, the peak action falls in the afternoon to early evening. So the window to watch for the strongest insulin effect — and the highest risk of hypoglycemia — is roughly mid‑afternoon to early evening, about 1:30 pm to 7:30 pm. The other time ranges would miss the typical peak period for a morning NPH dose, making them less relevant for monitoring peak action.