# Metabolic Syndrome > Metabolic syndrome for NEET-PG Medicine: NCEP and IDF criteria, insulin resistance, Asian Indian waist thresholds and the cardiovascular risk it signals. - Canonical URL: https://prepelephant.com/topics/neet-pg/medicine/metabolic-syndrome - Exam / course: NEET-PG · Subject: Medicine - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-08 - Last updated: 2026-10-08 - Reference basis: Harrison's Principles of Internal Medicine; Davidson's Principles and Practice of Medicine; Williams Textbook of Endocrinology - How to cite: "Metabolic Syndrome", PrepElephant, https://prepelephant.com/topics/neet-pg/medicine/metabolic-syndrome ## Direct answer Metabolic syndrome is a cluster of central obesity, raised triglycerides, low HDL cholesterol, raised blood pressure and raised fasting glucose, diagnosed when three of five criteria are present. It reflects underlying insulin resistance and raises the risk of type 2 diabetes and atherosclerotic cardiovascular disease. It is a risk state to be managed through its components, not a single disease. ## What you must remember - **Diagnosis:** three or more of five criteria: waist circumference, triglycerides of 150 mg/dL or more, HDL below 40 mg/dL in men or 50 mg/dL in women, blood pressure of 130/85 mmHg or more or on treatment, and fasting glucose of 100 mg/dL or more or on treatment. - **IDF requirement:** central obesity is mandatory, plus any two other criteria, with South Asian waist thresholds of 90 cm in men and 80 cm in women. - **Core mechanism:** insulin resistance in muscle and liver, with visceral fat releasing free fatty acids that drive hepatic VLDL output and hypertriglyceridaemia. - **Adipokines:** low adiponectin and high leptin, TNF-alpha and IL-6 link visceral fat to endothelial dysfunction and low-grade inflammation. - **Indian phenotype:** Asian Indians develop the syndrome at lower BMI, with high visceral fat and earlier onset, the so-called thin-fat pattern. - **Hepatic link:** fatty liver disease often coexists and is commonly one of the earliest visible markers of insulin resistance. - **Management:** weight loss of 5 to 10 percent and regular activity come first, then each component is treated on its merits, with statins for dyslipidaemia and antihypertensives for raised blood pressure. ## Worked example: a clinic visit with three criteria A 52-year-old South Asian man attends with a BMI of 28, a waist of 94 cm, triglycerides of 210 mg/dL, HDL of 44 mg/dL, blood pressure of 124/80 mmHg and fasting glucose of 108 mg/dL. Waist, triglycerides and glucose meet the criteria, so the diagnosis stands with three components even though HDL and blood pressure are normal. 1. **Screen for diabetes:** HbA1c is measured; it is not part of the metabolic syndrome criteria but is needed for care. 2. **Assess cardiovascular risk:** A cardiovascular risk score guides the statin decision. 3. **Check the liver:** Liver enzymes are measured, and an ultrasound checks for fatty liver. 4. **Start lifestyle change:** Lifestyle change with a clear weight target is started, and fasting triglycerides are rechecked after three months. 5. **Escalate if needed:** If triglycerides remain very high, fibrate or omega-3 therapy may be considered, and metformin is an option when prediabetes is high risk. The review at follow-up is driven by the components that remain abnormal rather than by the label itself. ## Where the examiner tests the criteria Metabolic syndrome questions usually test thresholds rather than mechanism. - **Trap:** Using one HDL cut-off for both sexes. — **Correct:** The HDL threshold is 40 mg/dL in men but 50 mg/dL in women, and the South Asian waist threshold is lower than the general one. - **Trap:** Counting HbA1c as a criterion. — **Correct:** HbA1c is the test for diabetes, not one of the metabolic syndrome criteria. - **Trap:** Equating metabolic syndrome with diabetes. — **Correct:** A patient with three criteria and normal fasting glucose still needs cardiovascular risk management. - **Trap:** Treating the syndrome and insulin resistance as the same thing. — **Correct:** The syndrome is a clinical cluster defined by criteria, while insulin resistance is the mechanism that links them. ## Frequently asked questions ### How many criteria are needed to diagnose metabolic syndrome? Metabolic syndrome is diagnosed when three or more of five criteria are present: abdominal obesity, raised triglycerides, reduced HDL cholesterol, raised blood pressure and raised fasting glucose. Drug treatment for any single component counts as meeting that criterion. ### What is the IDF requirement for metabolic syndrome? The International Diabetes Federation definition makes central obesity mandatory, then requires any two of the other four criteria. South Asian waist thresholds of 90 cm in men and 80 cm in women are used in that definition for Indian patients. ### Does HbA1c form part of the metabolic syndrome criteria? No, HbA1c is not a criterion for metabolic syndrome, although it is used to screen for diabetes in affected patients. The criteria use fasting glucose, while HbA1c guides diabetes diagnosis and treatment separately. ### Why are Asian Indians considered at higher risk of metabolic syndrome? Asian Indians develop insulin resistance and central fat at a lower BMI than Europeans, with a high proportion of visceral fat, so the syndrome appears earlier. This is why South Asian waist thresholds and lower BMI cut-offs are used when screening Indian patients. ### Which drugs treat the components of metabolic syndrome? Statins treat dyslipidaemia, antihypertensives treat raised blood pressure, and metformin may be used in high-risk prediabetes. Fibrates or omega-3 fatty acids are used for severe hypertriglyceridaemia, while lifestyle change remains first-line for the whole syndrome.