What is a normal HbA1C in the UK?

What is a normal HbA1C in the UK?

20-41 mmol/mol (or 4-6%) – is a normal HbA1C.
The haemoglobin A1C test (HbA1C) measures your average blood sugar level over the last 3 months. This test doesn’t require fasting and can be done any time.

How are prediabetes and diabetes diagnosed?

By testing your and HbA1C (and blood sugar) levels.

HbA1C in prediabetes and diabetes

• Normal HbA1c = 20-41 mmol/mol (or 4-6%)
• Prediabetes is diagnosed if your HbA1c = 42-47 mmol/L (6-6.5%) (twice)
• Diabetes is diagnosed if your HbA1c = 48 mmol/mol or over (>6.5%) (twice).

HbA1C mmol/mol and %

Confusingly HbA1c comes in 2 different units. Mmol/mol is the more modern unit. These are the equivalent values.

42 mmol/mol = 6.0% = prediabetes
48 = 6.5 = diabetes
53 = 7
59 = 7.5
64 = 8
75 = 9.

Diabetes UK has a converter to convert HbA1C from mmol/mol to %, and vice versa.

Summary

We have described what is a normal HbA1C in the UK. We hope it has been helpful.

Other resource

How do you diagnose diabetes and prediabetes?

Last Reviewed on 7 May 2024