A client who self-administered morning regular insulin and NPH, after a light breakfast with no intake for 3 hours, becomes weak and nervous with confusion. Which condition best explains this scenario?

• A. Hyperglycemia
• B. Hyperinsulinemia
• C. Hypoglycemia
• D. Hypoinsulinemia

Answer: (C)

When insulin is active but there isn’t enough glucose coming in, blood sugar can fall below normal. Regular insulin acts within a few hours, and NPH lasts longer, so after a light breakfast with no further intake for several hours, the insulin continues to lower blood glucose while dietary glucose is limited. That mismatch leads to hypoglycemia, which explains the weakness, nervousness, and confusion—the brain isn’t getting the glucose it needs.

In this scenario, the best explanation is low blood glucose caused by insulin effect outpacing dietary intake. Hyperglycemia wouldn’t fit the symptoms, and hypoinsulinemia or hyperinsulinemia describe insulin levels rather than the immediate cause; the patient’s condition is hypoglycemia due to too much insulin relative to available glucose. If the person is conscious, quick-acting carbohydrates are appropriate; if not, emergency treatment with IV dextrose or glucagon is needed.