Pre-Diabetes in Singapore: Early Warning Signs and How Screening Catches It

Pre-diabetes means your blood sugar is higher than normal but not yet high enough to be diabetes. It usually causes no obvious symptoms, which is why it is most often found through a blood test rather than how you feel. In Singapore, about 430,000 adults aged 18–69 have pre-diabetes, and without changes to diet and activity, roughly one in three goes on to develop type 2 diabetes within eight years. The encouraging part: pre-diabetes can often be reversed.

What is pre-diabetes?

Pre-diabetes is the stage between normal blood sugar and type 2 diabetes. Clinically, it covers two overlapping states: impaired fasting glucose (IFG), where fasting blood sugar is raised, and impaired glucose tolerance (IGT), where blood sugar stays high after a glucose drink. Both signal that the body is struggling to manage sugar efficiently — an early warning, not yet a diagnosis of diabetes.

Crucially, pre-diabetes is usually “silent.” Most people feel completely well, which is exactly why so many cases go unnoticed until a routine screening picks them up.

How common is pre-diabetes in Singapore?

Pre-diabetes is one of Singapore’s biggest preventive-health issues, and it sits at the centre of the national War on Diabetes, declared by the Ministry of Health in 2016.

• About 430,000 Singaporeans aged 18–69 (around 14%) have pre-diabetes (MOH / Health Promotion Board).
• Without lifestyle change, at least one in three people with pre-diabetes is likely to develop type 2 diabetes within eight years (MOH).
• More broadly, one in three Singaporeans has a lifetime risk of developing diabetes (MOH).

These numbers matter because the progression from pre-diabetes to diabetes is, in many cases, preventable through early detection and follow-up.

Early warning signs and why most people have none

The most important thing to understand is that pre-diabetes often has no symptoms at all. When subtle signs do appear, they can include:

• Increased thirst and more frequent urination
• Feeling unusually tired
• Blurred vision
• Cuts or wounds that heal slowly
• Darkened, velvety patches of skin (often on the neck or armpits), known as acanthosis nigricans

Because these signs are easy to miss or dismiss, doctors rely on risk factors rather than symptoms to decide who should be screened. You are at higher risk if you:

• Are 40 or older
• Have a family history of diabetes
• Are overweight, particularly with weight around the waist
• Are physically inactive
• Have high blood pressure or high cholesterol
• Had gestational diabetes during pregnancy
• Are of Indian or Malay ethnicity, which Singapore data associates with higher prevalence

How screening detects pre-diabetes

Pre-diabetes is identified through simple blood tests. In Singapore, screening typically starts with a fasting blood glucose test, sometimes followed by an oral glucose tolerance test (OGTT) for confirmation; HbA1c may also be used.

Note: Singapore’s clinical guidelines have traditionally favoured fasting glucose and OGTT for diagnosis, with HbA1c used as a supporting measure. Results should always be interpreted by a doctor, as a single reading is not the whole picture.

On screening frequency, Singapore guidance suggests testing from age 40 for those without risk factors (and at any age if risk factors are present), repeating every three years if results are normal and annually if pre-diabetes is detected.

Can pre-diabetes be reversed?

In many cases, yes — and this is the reason early detection is so valuable. Because pre-diabetes reflects how the body is currently handling sugar rather than permanent damage, sustained lifestyle changes can move blood sugar back toward the normal range or delay progression to diabetes. Evidence-based steps include:

• Modest weight loss (around 5–10% of body weight, if overweight)
• Regular physical activity — a common target is about 150 minutes of moderate exercise per week
• Dietary adjustments — reducing refined carbohydrates and sugar-sweetened drinks (Singapore’s Nutri-Grade labels can help you compare)
• Structured support — the Health Promotion Board runs a 12-week Diabetes Prevention Programme for eligible residents

These changes are not a guarantee, and progress varies from person to person — but pre-diabetes is one of the more modifiable health conditions, which makes catching it early genuinely worthwhile.

When should you get screened in Singapore?

If you are 40 or older, or younger with any of the risk factors above, it is worth discussing a screening with your doctor. Singapore Citizens and Permanent Residents may be eligible for subsidised screening through the Screen For Life programme.

A blood glucose check is a standard component of most general check-ups. You can see what is covered in Fusion Medical’s health screening packages, which include glucose and other metabolic markers. Women who had gestational diabetes during pregnancy carry a higher long-term risk and may want to factor regular glucose checks into their ongoing women’s health screening.

Frequently asked questions

This article is for general information and is not a substitute for personalised medical advice. Please consult a doctor about your individual screening needs.