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Glossary

Hemoglobin A1C

Also known as: HbA1c, A1C, glycated hemoglobin

Medically reviewed, last updated

Hemoglobin A1C is a blood test that measures the percentage of glycated hemoglobin in the blood over the past 2-3 months. It is the standard diagnostic test for type 2 diabetes (A1C ≥ 6.5%) and prediabetes (A1C 5.7-6.4%). Used for both screening and ongoing management.

The A1C-glucose relationship can run slightly higher in Black patients than in white patients at the same average glucose, which is one reason continuous glucose monitoring is now recommended alongside A1C for management decisions. See also CGM.

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Medical Disclaimer

This glossary entry is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition.