Type 2 diabetes: diagnosis, targets and treatment
A guide to how type 2 diabetes is diagnosed, what the numbers mean, which medicines are used and why, and the follow-up that prevents complications — written for patients seen at Uttarbanga Clinic, Cooch Behar.
টাইপ ২ ডায়াবেটিস কীভাবে ধরা হয়, কোন পরীক্ষার কী মানে, কোন ওষুধ কেন দেওয়া হয় এবং জটিলতা রোধে কী কী পরীক্ষা নিয়মিত করাতে হয় — কোচবিহারের উত্তরবঙ্গ ক্লিনিকের রোগীদের জন্য লেখা।
Type 2 diabetes is a long-term condition in which the body cannot use insulin effectively, so blood glucose rises. It is diagnosed by an HbA1c of 6.5% or higher, a fasting glucose of 126 mg/dL or higher, or a 2-hour glucose of 200 mg/dL or higher — usually confirmed on two occasions. It is managed with dietary change, activity and medicines, and good control prevents damage to the heart, kidneys, eyes and nerves. Dr Soumya Ghosh, MD (General Medicine), manages type 2 diabetes at Uttarbanga Clinic on Sunity Road, Cooch Behar.
Key facts
- Diagnosed at HbA1c ≥ 6.5%, fasting glucose ≥ 126 mg/dL, or 2-hour OGTT ≥ 200 mg/dL.
- South Asians develop type 2 diabetes roughly a decade earlier and at a lower BMI than western populations.
- Metformin remains first-line for most people; SGLT2 inhibitors and GLP-1 agonists are added for heart and kidney protection.
- A common HbA1c target is under 7%, individualised — often relaxed in older adults to avoid hypoglycaemia.
- Annual screening of eyes, kidneys (urine ACR), feet, blood pressure and lipids is what prevents complications.
How is type 2 diabetes diagnosed?
Type 2 diabetes is diagnosed on blood tests, not on symptoms. Any one of three results establishes it: an HbA1c of 6.5% or above, a fasting plasma glucose of 126 mg/dL or above, or a glucose of 200 mg/dL or above two hours into an oral glucose tolerance test. Because a single abnormal result can be misleading, diagnosis normally requires two abnormal results — either the same test repeated, or two different tests — unless the patient has clear symptoms alongside an unequivocally high glucose.[1]
| Test | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| HbA1c | < 5.7% | 5.7 – 6.4% | ≥ 6.5% |
| Fasting glucose | < 100 mg/dL | 100 – 125 | ≥ 126 |
| 2-hour OGTT | < 140 mg/dL | 140 – 199 | ≥ 200 |
- HbA1c
- Glycated haemoglobin — the proportion of haemoglobin with glucose attached. Because red blood cells live about three months, HbA1c reflects average blood glucose over roughly the preceding 8 to 12 weeks, rather than the level on the morning of the test. It can read falsely low in anaemia, recent blood loss or haemoglobinopathies, which are common enough in this region to matter.
- Prediabetes
- Glucose values above normal but below the diabetes threshold. It is not a benign label: a substantial proportion progress to diabetes within a few years, and the progression is preventable with weight loss and activity.
Why do Indians get diabetes earlier and at a lower weight?
South Asians develop type 2 diabetes about ten years earlier than European populations and at a considerably lower body mass index. The usual explanation is the so-called thin-fat phenotype: for a given BMI, South Asians carry more visceral fat around the abdominal organs and less skeletal muscle, and visceral fat is the metabolically active kind that drives insulin resistance.[2] The practical consequence is that a person in Cooch Behar who looks slim and has a BMI of 24 may still be at meaningful risk. Waist circumference — over 90 cm in men, over 80 cm in women — is often more informative than weight, and screening should start earlier than western guidelines suggest, particularly where there is a family history.
How is type 2 diabetes treated now?
Treatment of type 2 diabetes is chosen for the whole person rather than for the glucose number alone. Metformin remains the first medicine for most patients: it is effective, weight-neutral, inexpensive and has decades of safety data. What has changed over the last ten years is that two newer classes are now started early where there is heart disease, kidney disease or obesity, because they protect those organs independently of their effect on glucose.
| Class | Example | Effect on weight | Additional benefit |
|---|---|---|---|
| Biguanide | Metformin | Neutral | First-line; long safety record; low cost |
| SGLT2 inhibitor | Dapagliflozin, empagliflozin | Modest loss | Heart failure and kidney protection |
| GLP-1 receptor agonist | Semaglutide, liraglutide | Substantial loss | Cardiovascular benefit; weight reduction |
| DPP-4 inhibitor | Sitagliptin | Neutral | Well tolerated; few interactions |
| Sulfonylurea | Glimepiride | Gain | Low cost; carries hypoglycaemia risk |
| Insulin | Basal, premixed | Gain | Effective at any level of glucose |
Dr Ghosh was a contributing investigator and co-author on the MESIDA trial, a multicentre randomised double-blind Phase 3 study of a triple fixed-dose combination of dapagliflozin, sitagliptin and metformin in Indian adults with type 2 diabetes, published in International Journal of Diabetes in Developing Countries in 2024.[3] The combination studied was metformin hydrochloride 1000 mg extended release with sitagliptin phosphate 100 mg and dapagliflozin propanediol 10 mg, given as a single daily tablet — the point of a fixed-dose combination being that three medicines taken as one are more reliably taken at all.
What HbA1c should I be aiming for?
For most adults with type 2 diabetes the target is an HbA1c below 7%, but the figure is individualised rather than universal. A younger person recently diagnosed, with no other conditions and a long life expectancy ahead, benefits from tighter control because the gain in avoided complications accumulates over decades. An older person, someone with established cardiovascular disease, or anyone who has had episodes of hypoglycaemia is usually given a more relaxed target — often 7.5% or 8% — because the harm from a low sugar in that group outweighs the marginal benefit of a lower average. Once stable, HbA1c is checked every three to six months.
Which checks prevent diabetes complications?
Diabetes damages small and large blood vessels quietly, over years, and the damage is largely preventable by finding it early. Structured follow-up at Uttarbanga Clinic includes HbA1c every three to six months, a dilated eye examination once a year, annual urine albumin-to-creatinine ratio and kidney function, foot examination for sensation and circulation, and blood pressure and cholesterol at every visit. That last point is the one most often missed: for a person with type 2 diabetes, controlling blood pressure and lipids prevents more heart attacks and strokes than controlling glucose alone. Diabetes care is, in practice, cardiovascular and kidney care.
Can type 2 diabetes go into remission?
Yes, in some people, and the honest word is remission rather than cure. Where substantial weight loss is achieved — typically 10 to 15 kg — and particularly within the first few years after diagnosis, blood glucose can return to the non-diabetic range without medication and stay there. The DiRECT trial demonstrated this with a structured weight-management programme. It is not guaranteed, it becomes less likely the longer diabetes has been present, and it requires the weight loss to be maintained. Anyone in remission still needs annual monitoring, because the underlying tendency has not disappeared.
সংক্ষেপে (বাংলায়)
টাইপ ২ ডায়াবেটিস একটি দীর্ঘমেয়াদি রোগ। ভারতীয়দের মধ্যে এটি কম বয়সে ও কম ওজনেও হতে পারে, তাই পেটের মাপ ও পারিবারিক ইতিহাস থাকলে আগেভাগে পরীক্ষা করানো দরকার। HbA1c ৬.৫% বা তার বেশি হলে ডায়াবেটিস ধরা হয়। মেটফরমিন-সহ আধুনিক ওষুধ (SGLT2, GLP-1) শুধু সুগার নয়, হার্ট ও কিডনিকেও রক্ষা করে। বছরে একবার চোখ, কিডনি ও পায়ের পরীক্ষা করালে ভবিষ্যতের জটিলতা অনেকটাই এড়ানো যায়। কোচবিহারের উত্তরবঙ্গ ক্লিনিকে ডাঃ সৌম্য ঘোষের কাছে ডায়াবেটিসের চিকিৎসা ও নিয়মিত ফলো-আপ করা হয়।
Written and medically reviewed by Dr Soumya Ghosh, MBBS, MD (General Medicine)
Consultant Physician (Internal Medicine), Uttarbanga Clinic, Cooch Behar · Assistant Professor, Dept. of General Medicine, MJN Medical College & Hospital, Cooch Behar
West Bengal Medical Council Reg. No. 67751 — verify on the Indian Medical Register · ORCID 0009-0004-1686-5540 · Last reviewed
Frequently asked questions
Can type 2 diabetes be reversed?
Early type 2 diabetes can go into remission in some people with substantial and sustained weight loss, particularly within the first few years after diagnosis. The accurate term is remission rather than cure — the underlying tendency remains, and annual monitoring is still needed. It becomes less likely the longer diabetes has been present.
What is a good HbA1c target?
For most adults, below 7%. The target is individualised: a younger person newly diagnosed benefits from tighter control, while an older person or someone who has had low-sugar episodes is usually given a safer target of 7.5% to 8%.
Is metformin still the first medicine?
For most people, yes. Metformin remains first-line because it is effective, weight-neutral, inexpensive and very well studied. SGLT2 inhibitors or GLP-1 agonists are increasingly started early alongside it when there is heart disease, kidney disease or obesity.
How often should I be tested?
HbA1c every three to six months once treatment is stable, with a dilated eye examination, urine albumin, kidney function and a foot check once a year. Blood pressure and cholesterol are checked at every visit.
Does diabetes always need insulin eventually?
No. Many people with type 2 diabetes never need insulin. It becomes necessary when tablets no longer achieve adequate control, during illness or surgery, or where the pancreas has lost most of its insulin-producing capacity. Starting insulin is not a failure — it is a change of tool.
Diabetes consultation with Dr Soumya Ghosh
Uttarbanga Clinic, Sunity Road, near Police Line Chowpathi, Ward 20, Cooch Behar 736101. Monday to Saturday, 10:00–20:00. Walk-in or book ahead.
Related guides
References and guidelines
- American Diabetes Association Professional Practice Committee. Classification and Diagnosis of Diabetes: Standards of Care in Diabetes. diabetesjournals.org/care
- Yajnik CS. The lifecycle effects of nutrition and body size on adult adiposity, diabetes and cardiovascular disease. Obesity Reviews. See also the Indian Council of Medical Research guidelines for management of type 2 diabetes, ICMR.
- Research Society for the Study of Diabetes in India (RSSDI) — clinical practice recommendations. rssdi.in. International Diabetes Federation, idf.org. Indian Council of Medical Research guidelines for management of type 2 diabetes, icmr.gov.in.
- MESIDA investigators. Efficacy and safety of a fixed-dose combination of dapagliflozin, sitagliptin and metformin in Indian adults with type 2 diabetes. Int J Diabetes Dev Ctries 2024;44(1):67–76. doi:10.1007/s13410-024-01321-9
- Lean MEJ, Leslie WS, Barnes AC, et al. Primary care-led weight management for remission of type 2 diabetes (DiRECT). Lancet 2018;391:541–51. doi:10.1016/S0140-6736(17)33102-1
This page is general health information written and reviewed by a registered medical practitioner. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a doctor who has examined you. Diagnosis and treatment are individualised after clinical assessment. Medicines mentioned here are prescription-only and must be taken under medical supervision. See the editorial and medical review policy. Last reviewed .