Fasting vs Post-Meal Comparison
Log 7 days of fasting and post-meal (2-hour) blood glucose to identify patterns like the dawn phenomenon or post-prandial spikes.
Educational estimator only - not medical advice.
| Day | Fasting | Post-Meal (2h) |
|---|
Enter at least 2 days with fasting and post-meal readings to see your pattern analysis.
This calculator compares your fasting blood glucose (measured before breakfast after 8+ hours without food) with your post-meal glucose measured 2 hours after eating:
Dawn Phenomenon: Consistently high fasting glucose (even with lower post-meal values) is caused by hormones - cortisol, growth hormone - released in the early morning hours that raise glucose to prepare for waking. It's more common in people with type 1 and type 2 diabetes.
Post-Prandial Spikes: When post-meal glucose is consistently elevated (above 180 mg/dL / 10 mmol/L), it may indicate insufficient insulin response or carbohydrate intake that exceeds your tolerance. Monitoring the 2-hour mark is the ADA standard for post-meal assessment.
Chapter 2 of the FOD Mature Series explains how to interpret fasting versus post-meal patterns, what the dawn phenomenon means for your management plan, and how to use this data to time medications and meals more effectively.
FOD Mature Series - Ch. 2This calculator is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider or a qualified diabetes educator regarding your personal health and any changes to your management plan.