What best describes a basal-bolus insulin regimen?

• A. A long-acting insulin for baseline and rapid-acting insulin for meals
• B. A rapid-acting insulin used for meals only
• C. Insulin only used during illness
• D. An insulin therapy regimen with no bolus

Answer: (A)

Basal-bolus regimens imitate how insulin works in the body by separating background needs from mealtime needs. A long-acting insulin provides a steady baseline to suppress liver glucose production between meals and overnight, while a rapid-acting insulin given at meals covers the carbohydrate you eat and helps prevent post-meal glucose spikes. This pairing—basal for the steady background and bolus (rapid-acting) for meals—offers flexible, targeted control of glucose levels throughout the day.

If you only used rapid-acting insulin for meals, there would be no ongoing background insulin to maintain fasting glucose. If insulin were used only during illness, or there were no bolus doses at meals, the regimen wouldn’t properly manage normal daily glucose fluctuations.