HOMA-IR (Insulin Resistance) Blood Test in Singapore

HOMA-IR stands for Homeostatic Model Assessment of Insulin Resistance. It is not a single measurement but an index calculated from two fasting blood values — your fasting insulin and your fasting glucose. It estimates how resistant your body has become to insulin, the hormone that moves sugar out of the blood and into cells. A higher HOMA-IR means your body is making more insulin to keep blood sugar normal, which is the hallmark of insulin resistance — often the earliest step on the road to type 2 diabetes.

HOMA-IR is worked out from your fasting insulin and fasting glucose. In conventional units it is (fasting insulin in µU/mL × fasting glucose in mg/dL) ÷ 405; in SI units it is (fasting insulin in mU/L × fasting glucose in mmol/L) ÷ 22.5. You do not need to do the maths — the laboratory or your doctor calculates it. What matters is that both values are taken fasting, because eating changes insulin and glucose and would make the result meaningless.

Yes. HOMA-IR depends on fasting insulin and fasting glucose, so an 8 to 10 hour overnight fast is required. Plain water is fine, and you should avoid food, coffee and sugary drinks during the fast. Continue your usual medications unless your doctor has advised otherwise. This is the one important preparation step — a non-fasting sample cannot be used to calculate HOMA-IR.

As a general guide, using Asian-population cut-offs, a HOMA-IR below about 1.4 reflects good insulin sensitivity, 1.4 to 1.9 is borderline or early insulin resistance, 2.0 to 2.5 suggests insulin resistance is likely, and above about 2.5 indicates significant insulin resistance. (Western studies often use a single cut-off of about 2.5.) These cut-offs are not absolute — they vary by population, laboratory and insulin assay. Your doctor interprets your number in context, and the trend over time is often more useful than a single reading.

They look at different stages of the same problem. HbA1c and glucose measure your blood sugar, which is what is used to diagnose pre-diabetes and diabetes. HOMA-IR looks one step earlier: at how hard your body is working (through insulin) to keep that blood sugar normal. Insulin resistance can be present for years, with a normal HbA1c, before blood sugar finally starts to rise. So HOMA-IR can flag a problem earlier — while there is more time to reverse it — whereas HbA1c confirms and monitors diabetes. They complement each other.

HOMA-IR is worth considering if you are overweight (especially around the waist), have a family history of type 2 diabetes, have polycystic ovary syndrome (PCOS), fatty liver, high blood pressure or an unfavourable cholesterol pattern — the features of metabolic syndrome — or simply want an early read on your metabolic health while your blood sugar is still normal. It is not a routine test for everyone. If you are unsure whether it applies to you, WhatsApp us and we will advise.

Insulin resistance is often very responsive to lifestyle change. The most effective steps are losing excess weight (particularly around the middle), regular physical activity including both aerobic exercise and resistance training, reducing refined carbohydrates and sugary drinks, increasing fibre, and improving sleep. These can meaningfully lower HOMA-IR over weeks to months. Where appropriate — for example in PCOS or pre-diabetes — your doctor may also consider an insulin-sensitising medication. Repeating the test after a few months shows whether your changes are working.

HOMA-IR is a useful, practical estimate of insulin resistance, but it is an estimate rather than a precise diagnostic test. It primarily reflects hepatic (liver) insulin resistance rather than whole-body insulin sensitivity, and it depends on the fasting insulin measurement, which varies between laboratories and assays, so the exact number can shift a little between tests. The research gold standard is a specialised procedure called the hyperinsulinaemic–euglycaemic clamp; HOMA-IR is the practical single-blood-sample alternative and correlates well with it. It is best interpreted alongside your other results and tracked as a trend over time rather than read as a single hard cut-off — used that way, it is a valuable early-warning tool.

At our clinics the HOMA-IR test is $87.20 NETT, inclusive of GST (it includes the fasting insulin and fasting glucose needed for the calculation). A doctor consultation (from $49.05 NETT) may be required for a specifically requested test, so your doctor can confirm it is appropriate and interpret your result; this is waived if you have a referral or when it is part of a screening panel. The fasting insulin and glucose are also included in our Cardiac Screening 4 panel. See the full pricing table above or WhatsApp 8095 3275 to confirm current rates.