4 doctors weighed in:
How is a hba1c percentile determined?
4 doctors weighed in

Dr. Timothy Ashley
Internal Medicine & Pediatrics
2 doctors agree
In brief: Directly
Hba1c is a direct measure of the % of red blood cells that are "glycated", meaning they have unusual carbohydrates stuck to them. Whatever proportion have the sugar on them, that's the %hba1c.
Patients with higher average sugars stick more to their red blood cells. It's a wonderfully simple, fortunately valid, concept.

In brief: Directly
Hba1c is a direct measure of the % of red blood cells that are "glycated", meaning they have unusual carbohydrates stuck to them. Whatever proportion have the sugar on them, that's the %hba1c.
Patients with higher average sugars stick more to their red blood cells. It's a wonderfully simple, fortunately valid, concept.
Dr. Timothy Ashley
Dr. Timothy Ashley
Thank
Dr. Stanley Schwartz
Internal Medicine - Endocrinology
In brief: See below
It measures percent of normal hemoglobin molecules in red cells (that carries oxygen), that have glucose chemically attached to the molecule.

In brief: See below
It measures percent of normal hemoglobin molecules in red cells (that carries oxygen), that have glucose chemically attached to the molecule.
Dr. Stanley Schwartz
Dr. Stanley Schwartz
Thank
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