A client on insulin (Novolin) did not eat breakfast. When is hypoglycemia most likely to occur after the dose?

• A. Immediately after dose
• B. 2-4 hours after dose
• C. 4-6 hours after dose
• D. 8-12 hours after dose

Answer: (C)

Understanding when hypoglycemia can occur with short-acting insulin when a meal is skipped helps explain why this timing is most risky. Regular insulin like Novolin has its strongest glucose-lowering effect several hours after injection. If breakfast isn’t eaten, there’s nothing to raise blood sugar as the insulin is acting, so the patient is most vulnerable during the period when the insulin’s effect is at its peak. That peak, for this scenario, is in the 4 to 6 hour window after the dose.

So, hypoglycemia is most likely to occur about 4–6 hours after the dose because that’s when the insulin’s action is strongest and there’s no incoming dietary glucose to counterbalance it. Immediate after the dose is too early for peak effect, and after 2–4 hours the action is rising but the highest risk with no food aligns more with the later part of the active period. After 8–12 hours the insulin effect is winding down, making severe hypoglycemia less likely in this specific skipped-meal context.