- Prediabetes and type 2 diabetes sit on the same scale of rising blood sugar. The difference is how far along it has moved.
- Prediabetes: HbA1c 5.7–6.4%. Type 2 diabetes: 6.5% or higher (American Diabetes Association).
- Each year about 5–10% of people with prediabetes progress to diabetes, but many can return to normal.
- Prediabetes is usually managed with lifestyle changes. Diabetes often also needs medicines and regular checks for complications.
Hearing “prediabetes” and “type 2 diabetes” in the same conversation can be confusing. Are they different diseases? Is prediabetes just a milder version? The simplest way to think about it is a road. Normal blood sugar is at one end, type 2 diabetes is further along, and prediabetes is the stretch in between. The same underlying process drives both, mainly insulin resistance plus a pancreas that is starting to tire. Where you are on that road shapes the risks, the checks you need and the treatment options.
The numbers that separate them
Doctors use the same three blood tests for both conditions. Only the cut-off values differ. A diagnosis should usually be confirmed with a second test unless the result is clearly high with symptoms.
American Diabetes Association diagnostic ranges
ADA Standards of Care in Diabetes 2026. The markers show where the diabetes range begins. In mmol/L: fasting 5.6–6.9 and 2-hour 7.8–11.0 are prediabetes; 7.0 and 11.1 or higher are diabetes.
For a closer look at each test, see How Prediabetes Is Diagnosed and A1C vs Blood Glucose.
Side-by-side comparison
| Prediabetes | Type 2 diabetes | |
|---|---|---|
| HbA1c | 5.7–6.4% | 6.5% or higher |
| Fasting glucose | 100–125 mg/dL | 126 mg/dL or higher |
| 2-hour OGTT | 140–199 mg/dL | 200 mg/dL or higher |
| Symptoms | Usually none | Often none at first; later thirst, frequent urination, tiredness, blurred vision, slow-healing cuts |
| Complications | Higher risk of heart disease and stroke; early eye and nerve changes in some people | Heart disease, stroke, kidney disease, eye damage, nerve damage and foot problems |
| Treatment | Lifestyle changes first; metformin for some higher-risk people | Lifestyle plus, for most people, one or more medicines; regular eye, kidney and foot checks |
| Can it go back? | Often returns to normal glucose | Remission is possible for some, especially early on with major weight loss |
| Checks | Blood sugar test at least once a year | HbA1c every 3–6 months plus yearly complication screening |
The biggest practical difference is symptoms. Prediabetes almost never causes any, so most people find out from a routine blood test. Type 2 diabetes can also be silent for years, which is why many people already have early eye or kidney changes when they are diagnosed. If your last test showed prediabetes, a yearly recheck is the simplest way to catch any change early. Read more about signs and symptoms of prediabetes.
How often does prediabetes become diabetes?
Prediabetes does not always progress, but the risk is real. A major review in The Lancet estimated that about 5–10% of people with prediabetes develop diabetes each year, and that up to 70% may eventually do so without changes. At the same time, a similar share each year return to normal glucose levels.
Tabák et al., Lancet 2012; Knowler et al., N Engl J Med 2002.
In India, the ICMR-INDIAB survey found that about 11% of adults have diabetes and about 15% have prediabetes. That is tens of millions of people on the “in-between” stretch of the road. Learn more in What Happens to Prediabetes Over Time?
Why returning to normal matters
Getting from prediabetes back to normal glucose is worth the effort, even briefly. In a long-term follow-up of the Diabetes Prevention Program, people who reached normal glucose at least once had a 56% lower risk of later diabetes than those who stayed in the prediabetes range, whatever treatment group they were in.
Where blood sugar can go from prediabetes
Perreault et al., Lancet 2012.
Complications: not just a diabetes problem
Many people assume complications start only once diabetes is diagnosed. In fact, a large meta-analysis in the BMJ found prediabetes itself was linked with about a 13% higher risk of death from any cause and about a 15% higher risk of cardiovascular disease compared with normal blood sugar. That is one more reason to act early and to look after blood pressure and cholesterol too. See Diabetes and Heart Health.
Can type 2 diabetes be reversed?
Experts now use the word remission rather than cure. It means an HbA1c below 6.5% for at least three months without diabetes medicines. In the DiRECT trial in the UK, 46% of people with type 2 diabetes of up to six years’ duration reached remission after one year of a structured weight-loss program. Among those who lost 15 kg or more, 86% did. Remission is more likely early on and with larger weight loss, and blood sugar can rise again if weight returns, so ongoing checks remain important.
Do not stop or change diabetes medicines on your own. Some medicines can cause low blood sugar if your diet changes quickly. Talk to your doctor before starting a weight-loss program, and see them promptly if you have strong thirst, frequent urination, weight loss you cannot explain or blurred vision.
MythPrediabetes is “borderline,” so it is nothing to worry about.
FactPrediabetes carries its own heart risk and a high chance of progressing. It is also the stage where lifestyle changes work best.
Common questions
Can I have diabetes if I feel fine?
Yes. Type 2 diabetes often causes no symptoms for years. That is why screening blood tests matter, especially if you have risk factors.
My HbA1c is 6.4%. Is that nearly diabetes?
It is at the top of the prediabetes range, which means a higher risk of progressing. It is also a strong signal to act now. Discuss a plan and a repeat test with your doctor.
Do people with prediabetes need medicine?
Lifestyle changes come first. For some people at higher risk, such as those with a higher BMI, rising results or past gestational diabetes, a doctor may suggest metformin.
- Prediabetes and type 2 diabetes are stages on the same path, defined by blood test cut-offs.
- HbA1c 5.7–6.4% is prediabetes; 6.5% or higher is diabetes.
- About 5–10% of people with prediabetes progress each year, but many return to normal.
- Both carry heart risk; type 2 diabetes can sometimes go into remission with major weight loss.
- Next: Best breakfast for prediabetes: 12 ideas.
Sources
- American Diabetes Association Professional Practice Committee. 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes—2026. Diabetes Care. 2026;49(Suppl 1).
- Tabák AG, Herder C, Rathmann W, Brunner EJ, Kivimäki M. Prediabetes: a high-risk state for diabetes development. Lancet. 2012;379(9833):2279–2290.
- Knowler WC, Barrett-Connor E, Fowler SE, et al. Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. N Engl J Med. 2002;346(6):393–403.
- Perreault L, Pan Q, Mather KJ, et al. Effect of regression from prediabetes to normal glucose regulation on long-term reduction in diabetes risk. Lancet. 2012;379(9833):2243–2251.
- Cai X, Zhang Y, Li M, et al. Association between prediabetes and risk of all cause mortality and cardiovascular disease: updated meta-analysis. BMJ. 2020;370:m2297.
- Anjana RM, Unnikrishnan R, Deepa M, et al. Metabolic non-communicable disease health report of India: the ICMR-INDIAB national cross-sectional study (ICMR-INDIAB-17). Lancet Diabetes Endocrinol. 2023;11(7):474–489.
- Lean MEJ, Leslie WS, Barnes AC, et al. Primary care-led weight management for remission of type 2 diabetes (DiRECT): an open-label, cluster-randomised trial. Lancet. 2018;391(10120):541–551.
- Riddle MC, Cefalu WT, Evans PH, et al. Consensus report: definition and interpretation of remission in type 2 diabetes. Diabetes Care. 2021;44(10):2438–2444.
This article is for general education and is not a substitute for advice from your own doctor or healthcare team.