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A 33-year-old member asked:

What can cause a high hemoglobin a1c test?

2 doctor answers9 doctors weighed in
Dr. Brittany Chan
Dr. Brittany Chananswered
Pediatrics 10 years experience
Poor sugar control: Hemoglobin A1c measures average blood sugar over approximately the past 3 months. It is the measure of how much hemoglobin is attached to sugar molecules in the blood. Sugar in your blood binds to the hemoglobin of the red blood cell and stays there throughout the cell's lifetime (120 days). At high levels of blood sugar, more reacts w/ the hemoglobin, causing an elevated hemoglobin a1c.
Dr. Craig MacArthur
Pediatric Hematology and Oncology 34 years experience
Diabetes mellitus : Poorly controlled blood sugar levels over time, as in diabetes mellitus, results in higher levels of HGB a1c. If your HGB a1c is elevated, you should discuss with your doctor about diet, exercise, weight loss, and possibly medications.

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A 25-year-old member asked:

Do you have to fast for hemoglobin A1c test?

3 doctor answers11 doctors weighed in
Dr. Timothy Ashley
Internal Medicine and Pediatrics 15 years experience
No: For hba1c alone, no fasting is required, but it is often done with other tests, like cholesterol or blood sugar, for which fasting is indicated.

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Last updated Mar 31, 2020
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