DisclosureWe earn commission on partner links; ranking is set by clinician-vetted methodology — not advertisers.
Average blood sugar over the past 2-3 months. Healthy: <5.7%. Pre-diabetes: 5.7-6.4%. Diabetes: ≥6.5%.
Hemoglobin A1C reflects average plasma glucose over 8-12 weeks by measuring the percentage of hemoglobin with glucose attached. Normal: <5.7%. Prediabetes: 5.7-6.4%. Diabetes: ≥6.5%. GLP-1 RAs reduce A1C by 1.0-1.5% on average; tirzepatide by 2.0-2.3% at peak doses. A1C is the standard outcome metric in T2D trials.