Quick answer. Prediabetes means your blood sugar is higher than normal but not yet in the diabetes range, typically an HbA1c of 6.0% to 6.4% or a fasting glucose of 6.1 to 6.9 mmol/L. It is a warning sign, but it is often reversible with sustained lifestyle changes. Singaporeans and PRs aged 40 and above can be screened affordably through Screen for Life. This guide is general information, not medical advice.
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Prediabetes is a stage where blood sugar is raised but has not reached the diabetes threshold. It matters because it signals a higher risk of developing type 2 diabetes and heart disease, yet it is frequently reversible. In Singapore, prediabetes is often picked up during routine or subsidised screening such as Screen for Life. The good news is that lifestyle changes started early can prevent or delay progression to diabetes. This guide explains the numbers, what they mean and how to act.
At a glance
| Test | Normal | Prediabetes | Diabetes range |
|---|---|---|---|
| HbA1c | Below 6.0% | 6.0% to 6.4% | 6.5% or higher |
| Fasting plasma glucose | Below 6.1 mmol/L | 6.1 to 6.9 mmol/L | 7.0 mmol/L or higher |
| 2-hour glucose (OGTT) | Below 7.8 mmol/L | 7.8 to 11.0 mmol/L | 11.1 mmol/L or higher |
What the numbers mean
Prediabetes is defined by blood sugar that is above normal but below the diabetes range.
- HbA1c of 6.0% to 6.4% generally indicates prediabetes; borderline results may need a confirmatory fasting glucose or oral glucose tolerance test.
- Fasting glucose of 6.1 to 6.9 mmol/L falls in the prediabetes range.
- A single result is not a diagnosis; your doctor interprets it alongside your overall risk and may repeat the test.
Is prediabetes reversible?
Prediabetes is often reversible, and the goal is to return blood sugar toward normal and prevent type 2 diabetes.
- Reversal is not a one-time fix; it relies on sustained, long-term habits.
- Even modest weight loss and increased activity can meaningfully lower risk.
- Progression to diabetes is not inevitable, but without change the risk rises over time.
Your doctor can help set realistic, personalised goals.
Screening through Screen for Life
The Health Promotion Board’s Screen for Life (SFL) programme offers subsidised screening for eligible Singaporeans and PRs.
- Eligible citizens and PRs aged 40 and above can access subsidised screening, with out-of-pocket costs as low as $0 to $5 at participating CHAS GP clinics.
- Diabetes screening typically checks fasting glucose or HbA1c, along with blood pressure and cholesterol.
- Screening frequency is usually around once every three years, or as advised by your doctor.
Check current eligibility and details on HealthHub.
Lifestyle steps to prevent progression
Lifestyle change is the core of prediabetes care.
- Eating: Follow My Healthy Plate, choose wholegrains over refined carbohydrates, and cut back on sugary drinks (look for Nutri-Grade labels).
- Activity: Build regular moderate exercise into your week.
- Weight: Losing excess weight improves how your body handles glucose.
- Sleep and stress: Adequate sleep and stress management support healthier blood sugar.
Who should get checked
Consider screening, even before age 40, if you have risk factors such as a family history of diabetes, being overweight, high blood pressure, raised cholesterol, or a history of gestational diabetes. Asian populations, including in Singapore, can develop diabetes at lower body weights, so do not assume you are not at risk because you look slim.
Following up after a prediabetes result
If your result is in the prediabetes range, see your GP or polyclinic to confirm, assess your overall risk and plan follow-up. You may be advised to repeat blood tests periodically (for example, yearly) to track whether your numbers improve or rise. Acting early gives you the best chance to avoid diabetes.
How to prepare for a blood sugar test
Many prediabetes results come from a fasting test, so a little preparation helps. If a fasting glucose is planned, you will usually be asked not to eat or drink anything except plain water for several hours beforehand, often overnight. An HbA1c test does not require fasting, which is one reason it is convenient. Ask the clinic in advance which test you are having so you know whether to fast. Continue your usual medicines unless your doctor tells you otherwise, and mention any recent illness, as that can affect readings. It also helps to note your family history of diabetes and any past gestational diabetes, because these shape how your result is interpreted.
What to expect at the appointment
A prediabetes review is usually a calm, unhurried conversation rather than an emergency. Your doctor will explain what your number means, look at the wider picture (weight, blood pressure, cholesterol and waist size), and help you set realistic goals. You may be weighed and have your blood pressure checked. The focus is often on small, sustainable changes rather than a dramatic overhaul, and you will usually agree a plan for repeat testing so you can see whether your efforts are working.
Self-management at home
Day-to-day habits are where prediabetes is won or lost. Build movement into ordinary routines, such as walking after meals, taking stairs and reducing long periods of sitting. Watch portion sizes, swap sugary drinks for water or unsweetened options, and favour wholegrains, vegetables and lean protein. If you are carrying extra weight, even a modest, steady loss can improve how your body handles glucose. Aim for regular sleep and find ways to manage stress, both of which influence blood sugar. Progress is rarely linear, so treat setbacks as information rather than failure.
Questions to ask your doctor
- What exactly was my result, and which test should I repeat next?
- What is a realistic target for me, and by when should I recheck?
- Am I eligible for subsidised screening or any structured support?
- Are any of my current medicines affecting my blood sugar?
- What warning symptoms would mean I should come back sooner?
Common questions
Does prediabetes always become diabetes?
No. Prediabetes raises your risk, but progression is not inevitable. Sustained changes to eating, activity and weight can return many people’s blood sugar toward normal or delay diabetes for years.
Do I need medication for prediabetes?
Most people start with lifestyle changes alone. In some cases a doctor may discuss medicine, but that is an individual decision based on your overall risk. Never start any treatment without medical advice.
How often should I be retested?
This varies, but many people with prediabetes are advised to repeat blood tests periodically, such as yearly, to track whether their numbers are improving. Your doctor will recommend a schedule suited to you.
Related guides
- Best Endocrinology & Diabetes Clinics in Singapore — our editorial shortlist
- endocrinology & diabetes clinics directory
- Type 2 diabetes care
- Thyroid conditions
- Diet and monitoring
Sources
- HealthHub – Diabetes
- HPB – Screen for Life
- HealthHub – Plan Your Meals with My Healthy Plate
- Diabetes Singapore
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Related conditions and guides you may find useful:
- Coronary Artery Disease & Angina in Singapore
- Diabetes Complications in Singapore
- Heart Rhythm Disorders (Arrhythmias) in Singapore
- Heart Attack Warning Signs in Singapore
- Heart Failure in Singapore
- Heart Screening in Singapore
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