A 28-year-old client with type 1 diabetes receives regular i… | MyMerci
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Question
A 28-year-old client with type 1 diabetes receives regular insulin 6 units and NPH insulin 14 units subcutaneously at 7:30 AM, followed by breakfast at 8:00 AM. The nurse should monitor most closely for early hypoglycemia at which time?
11:00 PM (5.5 hours after injection)
26:00 PM (10.5 hours after injection)
310:00 AM (2.5 hours after injection)✓ Correct answer
48:30 AM (30 minutes after injection)
Explanation
Regular insulin has an onset of 30 minutes, peak of 2 to 4 hours, and duration of 5 to 7 hours. The earliest peak hypoglycemia risk after a 7:30 AM dose is approximately 10:00 AM (2.5 hours later). At 8:30 AM the client is just absorbing breakfast. NPH insulin peaks 4 to 12 hours after injection, so the 1:00 PM and 6:00 PM windows reflect NPH peak, not the earliest regular peak.
Clinical Judgment Two-insulin regimens require dual peak monitoring. Regular insulin peak: 2-4 hours after subcutaneous injection. NPH peak: 4-12 hours. The first hypoglycemia window after a 7:30 AM dose is the regular peak around 9:30-11:30 AM.
Memory Tip Regular = 30 min / 2-4 h / 5-7 h | NPH = 1-2 h / 4-12 h / 14-24 h
KR vs US US uses Humulin R / Novolin R (regular) and Humulin N / Novolin N (NPH). Korea also uses these brand names plus rapid analogs (lispro, aspart). NCLEX onset/peak/duration values are identical worldwide.
Clinical scenario
Clinical Practice Guide ADA 2025 standards recommend giving regular insulin 30 minutes before meals to align peak insulin with peak glucose. NPH provides basal coverage with a 4-12 hour peak. Hypoglycemia symptoms: shakiness, sweating, tachycardia, hunger, confusion. Treat per Rule of 15: 15 g rapid carb, recheck in 15 min.
Caution Always identify the earliest peak window first when multiple insulins are given together. Regular peak (2-4 h) precedes NPH peak (4-12 h). Snack timing should match peak windows.
Key concepts
Regular insulin — Short-acting human insulin. Subcutaneous onset 30 minutes, peak 2-4 hours, duration 5-7 hours. Given 30 minutes before meals to cover postprandial glucose. Only insulin approved for IV use.
NPH insulin — Intermediate-acting human insulin (neutral protamine Hagedorn). Onset 1-2 hours, peak 4-12 hours, duration 14-24 hours. Provides basal coverage. Cloudy appearance — must be gently rolled before drawing.
Rule of 15 — Hypoglycemia treatment standard for conscious clients: give 15 g rapid-acting carbohydrate (4 oz juice, 3-4 glucose tabs), wait 15 minutes, recheck blood glucose. Repeat if still under 70 mg/dL.