Prediabetes: Common Questions
Blood glucose above normal but below the diabetes threshold, also called non-diabetic hyperglycaemia.
Last revised
Prediabetes: the questions people actually ask, answered from published guidance.
Key takeaways
- HbA1c range: 42-47 mmol/mol
- Normal: below 42 mmol/mol
- Most useful single change: Ask for referral to the NHS Diabetes Prevention Programme.
- Commonest mistake: Treating it as a milder diagnosis that needs no action.
- See a doctor if any of the signs under "When to get help" below apply to you.
What is Prediabetes?
Blood glucose above normal but below the diabetes threshold, also called non-diabetic hyperglycaemia.
Why does it matter?
It carries a substantially raised risk of progressing, and it is the point at which intervention is most effective.
HbA1c range for Prediabetes?
42-47 mmol/mol.
NHS Diabetes Prevention Programme for Prediabetes?
Available on referral in England.
Weight loss target commonly used for Prediabetes?
5-10 per cent of body weight.
What is the single most useful thing to do?
Ask for referral to the NHS Diabetes Prevention Programme.
What is the most common mistake?
Treating it as a milder diagnosis that needs no action.
When should I see a doctor?
See a GP if you develop excessive thirst, passing much more urine than normal, unexplained weight loss, blurred vision or recurrent infections, which suggest progression to diabetes. Anyone with a family history, a high BMI, or a history of gestational diabetes should ask for regular HbA1c testing.
Where to go next
- Answers to the Common Questions on Prediabetes
- Prediabetes: Just the Figures
- Prediabetes — the reference entry
- What the Guidance Really Says About HbA1c
- The Evidence on Diabetic Foot Care, Without the Hype
When to get help
See a GP if you develop excessive thirst, passing much more urine than normal, unexplained weight loss, blurred vision or recurrent infections, which suggest progression to diabetes. Anyone with a family history, a high BMI, or a history of gestational diabetes should ask for regular HbA1c testing.
Where this comes from
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.
