Which test measures the level of hemoglobin A1c in the blood to determine average blood glucose over the past 2-3 months?

Which test measures the level of hemoglobin A1c in the blood to determine average blood glucose over the past 2-3 months?

• A. Random glucose test
• B. Fasting blood sugar
• C. Glycated protein test
• D. Hemoglobin A1c

Answer: (D)

Measuring HbA1c captures long-term glycemic control by looking at how much glucose has attached to hemoglobin over time. Red blood cells circulate for about 120 days, so the HbA1c percentage reflects average blood glucose over roughly 2–3 months, not just a single moment. This makes it the best choice for assessing how well blood sugar has been controlled over time. Other tests like random glucose or fasting glucose tell you a snapshot of glucose at one time and can be influenced by recent meals or day-to-day variation, so they don’t provide the same integrated view. A glycated protein test is less specific and not as routinely used for monitoring long-term glucose as HbA1c. Be aware that conditions altering red blood cell turnover can affect HbA1c accuracy.

Measuring HbA1c captures long-term glycemic control by looking at how much glucose has attached to hemoglobin over time. Red blood cells circulate for about 120 days, so the HbA1c percentage reflects average blood glucose over roughly 2–3 months, not just a single moment. This makes it the best choice for assessing how well blood sugar has been controlled over time. Other tests like random glucose or fasting glucose tell you a snapshot of glucose at one time and can be influenced by recent meals or day-to-day variation, so they don’t provide the same integrated view. A glycated protein test is less specific and not as routinely used for monitoring long-term glucose as HbA1c. Be aware that conditions altering red blood cell turnover can affect HbA1c accuracy.