Prediabetes: The Warning Stage Most People Miss

Prediabetes means your blood glucose is higher than usual but not in the range normally used to diagnose type 2 diabetes. It is a warning sign — and an opportunity to take action with support.

What HbA1c level indicates prediabetes?

In the UK, an HbA1c result of 42–47 mmol/mol (6.0–6.4%) is commonly described as the high-risk or prediabetes range. An HbA1c of 48 mmol/mol (6.5%) or above may indicate diabetes and needs clinical assessment or confirmation.

A result should always be interpreted by a healthcare professional in the context of your symptoms, risks and other tests.

Does prediabetes have symptoms?

Prediabetes often has no clear symptoms. That is why many people find out through a routine blood test or NHS Health Check.

Some symptoms such as thirst, frequent urination, tiredness, blurred vision or unexplained weight loss can be linked to high glucose, but they can have other causes. Speak to a GP if you notice them.

Can prediabetes be improved?

Many people can reduce their risk of progressing to type 2 diabetes through sustainable changes, such as becoming more active, improving sleep, making manageable food changes and reaching a weight that is healthier for them where appropriate.

Your GP may discuss local support or an NHS Diabetes Prevention Programme referral if you are eligible.

Start with a clear baseline

Tracking HbA1c results over time can show whether the changes you are making are having an effect. Log your HbA1c, glucose and blood pressure in Pulse and take your record to your next appointment.