# 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?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=362792&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## 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?

## Option

1. 1:00 PM (5.5 hours after injection)
2. 6:00 PM (10.5 hours after injection)
3. 10:00 AM (2.5 hours after injection) **✔ Correct answer**
4. 8:30 AM (30 minutes after injection)

**Correct answer: 3**

## 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.

## In-depth explanation

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.

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