Health LibraryTests & ProceduresHbA1c: The Three-Month Sugar Check
Tests & Procedures

HbA1c: The Three-Month Sugar Check

An average measure of your blood sugar over the past 8–12 weeks.

Medically reviewed
Updated 2026

How to interpret

Below 5.7% is normal; 5.7–6.4% is prediabetes; 6.5% or higher supports a diabetes diagnosis. Always confirmed with a repeat test.

Preparation

No fasting needed. Recent blood loss or certain haemoglobin variants can affect accuracy.

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