Which approach helps distinguish postprandial hyperglycemia from fasting hyperglycemia when adjusting therapy?

• A. Increase basal insulin without regard to meals.
• B. Rely on HbA1c alone to identify patterns.
• C. Evaluate premeal vs postmeal glucose patterns; use ICR and corrections around meals; adjust basal vs prandial accordingly.
• D. Only focus on fasting glucose values.

Answer: (C)

Distinguishing fasting from postprandial hyperglycemia relies on looking at glucose patterns around meals. If fasting glucose is consistently high, the main issue is overnight hepatic glucose production, so the focus should be on adjusting basal insulin (dose or timing) to control those basal levels. If postprandial glucose is elevated after meals, the problem is insufficient insulin to cover the carbohydrate load, so you adjust with the insulin-to-carbohydrate ratio and use corrections around meals to bring post-meal values down.

HbA1c alone doesn’t reveal when the highs occur because it’s an average of glucose over time and can mask whether elevations come from fasting periods or after meals. Likewise, focusing only on fasting values can miss significant postprandial spikes, and concentrating only on meals can leave fasting elevations unaddressed.

Therefore, the best approach is to evaluate premeal versus postmeal patterns and adjust basal versus prandial insulin accordingly, using the insulin-to-carbohydrate ratio and meal-time correction factors to tailor dosing.