6 doctors weighed in:
What is hemoglobin a1c?
6 doctors weighed in

Dr. Stephen Daquino
Sports Medicine
3 doctors agree
In brief: Average blood sugar
Hemoglobin A1c is a measure of the percentage of red blood cells permanently bound to glucose.
Normally about 5% of our red cells are glycosolated. If you have greater than 6.5% you are diabetic. It is not affected by fasting, and since our rbc's live 90-120 days, it reflects an average over that time.

In brief: Average blood sugar
Hemoglobin A1c is a measure of the percentage of red blood cells permanently bound to glucose.
Normally about 5% of our red cells are glycosolated. If you have greater than 6.5% you are diabetic. It is not affected by fasting, and since our rbc's live 90-120 days, it reflects an average over that time.
Dr. Stephen Daquino
Dr. Stephen Daquino
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Dr. Dean Giannone
Internal Medicine
In brief: Diabetic measure.
The HgbA1C is a measure reflective of your degree of diabetic control in the long term. It essentially represents a three month average of your fingersticks, as if you took a fingerstick every minute, night and day, eating and fasting, for three months straight and then averaged them all.
Technically, it's the percentage of red blood cells that have glucose attached to them.

In brief: Diabetic measure.
The HgbA1C is a measure reflective of your degree of diabetic control in the long term. It essentially represents a three month average of your fingersticks, as if you took a fingerstick every minute, night and day, eating and fasting, for three months straight and then averaged them all.
Technically, it's the percentage of red blood cells that have glucose attached to them.
Dr. Dean Giannone
Dr. Dean Giannone
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Dr. David Geffner
Internal Medicine - Endocrinology
In brief: A blood sugar test
The hemoglobin a1c test is a blood test used to diagnose type 1 and type 2 diabetes and then to gauge how well you're managing your diabetes.
It goes by many other names, including glycated hemoglobin, glycosylated hemoglobin, hemoglobin a1c and hba1c. The a1c test result reflects your average blood sugar level for the past two to three months.

In brief: A blood sugar test
The hemoglobin a1c test is a blood test used to diagnose type 1 and type 2 diabetes and then to gauge how well you're managing your diabetes.
It goes by many other names, including glycated hemoglobin, glycosylated hemoglobin, hemoglobin a1c and hba1c. The a1c test result reflects your average blood sugar level for the past two to three months.
Dr. David Geffner
Dr. David Geffner
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