HbA1c (Glycated Hemoglobin)
HbA1c reflects average blood glucose over roughly the past 2–3 months. It is used to monitor long-term glucose control and to help diagnose diabetes together with other criteria.
Check your result
Normal ranges
Common ADA-style cutoffs (NGSP %): below 5.7% — usual non-diabetes range; 5.7–6.4% — prediabetes range; 6.5% or higher — diabetes diagnostic threshold when confirmed by repeat testing or clinical context. IFCC mmol/mol ≈ (NGSP − 2.15) × 10.929.
Units: % (NGSP) / mmol/mol (IFCC)
Causes of deviations
Low levels:
Improved glucose control, some hemoglobin variants, hemolysis, recent blood loss — can falsely lower HbA1c; interpretation needs clinical context.
High levels:
Persistent hyperglycemia, prediabetes, diabetes, iron deficiency (can sometimes shift results — lab-dependent).
When to see a doctor
If HbA1c is in prediabetes or diabetes range, or if you have thirst, frequent urination, or unexplained weight change — see a clinician for confirmation and a care plan.
Related biomarkers
Panels
Conditions
Get your full lab report explained
Upload a PDF or photo from any lab and Healtix will read every marker, show the reference ranges and explain the deviations.
Upload full lab resultsThis information is for educational purposes and does not replace medical advice.
Check in calculator