Medical Emergencies · single question
HbA1c measures average blood glucose levels over what time period?
Show answer and explanation
Correct answer: A. 3 months (90 days)
- A. Correct. HbA1c (glycated hemoglobin) reflects the percentage of hemoglobin bound to glucose over the previous 2-3 months (~90 days), corresponding to the average lifespan of red blood cells. It is the gold standard for monitoring long-term glycemic control in diabetic patients.
- B. 1 month does not reflect the full red blood cell lifespan.
- C. 6 months overestimates the period — RBC lifespan is approximately 120 days.
- D. 1 week is too short — HbA1c reflects a longer period of red blood cell life.
Practice Medical Emergencies questions Medical Emergencies study notes