AIS Health Check · Understanding your results
HOMA2-IR: a clearer understanding of insulin resistance
You may have heard of HOMA-IR. HOMA2-IR is its updated version, developed by the University of Oxford.
Both estimate how effectively your body responds to insulin. This guide explains the difference and helps you understand your result.
What is HOMA2-IR?
Insulin helps move sugar from your blood into your body’s cells. Insulin resistance means those cells respond less effectively to insulin.
HOMA2-IR is a calculated estimate, rather than a separately measured blood substance. It uses fasting glucose with either fasting insulin or fasting C-peptide. C-peptide provides information about the insulin your pancreas produces. [1]
Higher HOMA2-IR results generally suggest lower insulin sensitivity. Your clinician interprets the number alongside your other results and health history.
For symptoms, causes and wider advice, read our complete insulin resistance guide.
How is HOMA2-IR different from HOMA-IR?
HOMA-IR: the original estimate
The original calculation is also called HOMA1-IR. It uses a simple formula combining fasting glucose and fasting insulin.
HOMA2-IR: the updated model
HOMA2 uses a computer model representing the body’s glucose–insulin relationship more fully. It accounts for physiological details omitted from the original formula.
This makes HOMA2 a more detailed estimate, rather than a definitive diagnosis. Oxford’s model also accommodates different insulin measurements and C-peptide. [1] [2]
A HOMA-IR result cannot be interpreted using HOMA2-IR comparison numbers. A lower number after switching methods does not necessarily mean your health improved.
What does my HOMA2-IR result mean?
There is no single normal range that applies to everyone. Oxford does not provide universal normal or abnormal cut-offs. [3]
Above 2.0
Your result may suggest insulin resistance. Your clinician checks your other blood results before drawing conclusions.
2.0 or below
Insulin resistance is still possible. Some studies identified it at lower HOMA2-IR levels.
This is a general guide based on the study comparisons below. The number 2.0 is not a universal diagnostic boundary. It does not define mild, moderate or severe insulin resistance.
Your clinician also considers glucose, HbA1c, weight, waist size and blood pressure. Cholesterol, medicines and medical history help complete the picture.
What have studies found in different populations?
Researchers chose a comparison number, called a cut-off, for each study. Results above it were considered potentially consistent with insulin resistance.
These numbers help interpret results, but cannot confirm or exclude insulin resistance alone. Different populations and laboratory methods can produce different comparison numbers.
| People studied | HOMA2-IR comparison number | How researchers selected it |
|---|---|---|
| European rural population Radikova, 2006 [4] |
1.21 | The level exceeded by approximately 25% of the study population. |
| Brazilian adults BRAMS, 2009 [5] |
Above 1.8 | The level exceeded by approximately 10% of healthy reference participants. |
| Adults in Maracaibo, Venezuela Bermúdez, 2014 [6] |
1.95 | A statistical comparison between the study’s reference and affected groups. |
| Qatari adults: insulin calculation Qatar Biobank, 2025 [7] |
1.128 or above | A reference-group threshold, tested against clinically defined comparison groups. |
| Qatari adults: C-peptide calculation Qatar Biobank, 2025 [7] |
1.307 or above | A separate calculation using C-peptide rather than insulin. |
Your nationality alone does not determine which cut-off applies. These studies used different methods to identify possible insulin resistance. They do not create one universal grading system.
Some thresholds simply identify higher results within a reference group. That does not automatically prove disease in someone exceeding them. The Qatar study did not validate its thresholds against direct insulin-sensitivity testing. [7]
How does HOMA2-IR fit with other blood tests?
Glucose
Your blood sugar level when the sample was collected.
HbA1c
Your average blood sugar over roughly two to three months.
Insulin
The hormone helping glucose enter cells. Fasting insulin helps put fasting glucose into context.
C-peptide
A marker of your body’s own insulin production. Kidney function can also affect the result.
HOMA2-IR does not diagnose pre-diabetes or diabetes. Glucose and HbA1c have separate clinical thresholds.
| Test | High-risk range | Diabetes range |
|---|---|---|
| HbA1c | 42–47 mmol/mol Often called pre-diabetes |
48 mmol/mol or above |
| Fasting plasma glucose | 5.5–6.9 mmol/L NICE high-risk range |
7.0 mmol/L or above |
NICE separately defines impaired fasting glucose as 6.1–6.9 mmol/L. Without symptoms, a second blood test is usually needed to confirm diabetes. [8]
How should I prepare for testing?
- Follow your laboratory’s fasting instructions, usually eight to twelve hours.
- Drink plain water if permitted by your testing provider.
- Tell your clinician about medicines, supplements and recent illness.
- Do not stop prescribed medicines without advice.
- Ask for individual fasting advice if you take medicines lowering blood sugar.
HbA1c itself does not require fasting. The fasting requirement relates to glucose, insulin and the HOMA2 calculation. Eating beforehand can make the estimate unsuitable for standard interpretation. [1] [3]
What happens if my result suggests insulin resistance?
Your next steps depend on your overall metabolic health. One result should not determine treatment by itself.
- Discuss the result alongside your glucose, HbA1c and other risk factors.
- Choose more vegetables, wholegrains, beans and other fibre-rich foods.
- Reduce sugary drinks and frequent highly refined carbohydrate snacks.
- Build regular physical activity into your week.
- If appropriate, work towards gradual, sustainable weight loss.
- Agree whether further assessment or repeat testing would help.
For people at high diabetes risk, NICE recommends ongoing prevention support. This includes at least annual blood testing. [8]
For repeat HOMA2-IR testing, use the same calculation method and similar fasting conditions. Using the same laboratory can also improve comparability. Small changes may reflect natural or laboratory variation. [1]
Understand more about your metabolic health
AIS Health Check combines blood testing with a doctor’s interpretation. Our insulin resistance assessment uses HOMA2-IR alongside your other blood results.
Explore the panel and check preparation details before booking.
Explore the insulin resistance testCommon questions about HOMA2-IR
Is HOMA2-IR a separate blood test?
No. It is calculated from fasting blood measurements using Oxford’s HOMA2 model.
Can normal HbA1c rule out insulin resistance?
No. HbA1c measures average blood sugar, rather than insulin sensitivity. Your body may produce more insulin while blood sugar remains controlled.
Is a HOMA2-IR result below 1 always excellent?
It should not automatically be labelled excellent. Glucose levels and insulin production still need consideration.
Can I compare my result with an online HOMA-IR calculator?
Check which model the calculator uses. Many use the original HOMA1 formula, which produces different results.
Is HOMA2-IR suitable for everyone?
No. Pregnancy, insulin treatment and some illnesses require different clinical assessment. Kidney problems can affect C-peptide-based interpretation. Your clinician decides whether the calculation is appropriate.
Sources and further reading
Research comparisons are drawn from published studies, not commercial laboratory ranges.
- Wallace, Levy and Matthews. Use and Abuse of HOMA Modeling. Diabetes Care, 2004.
- University of Oxford: history of the HOMA model.
- University of Oxford: HOMA calculator frequently asked questions.
- Radikova et al. Insulin sensitivity indices: proposed cut-off points. 2006.
- Geloneze et al. Brazilian Metabolic Syndrome Study: HOMA1-IR and HOMA2-IR. 2009.
- Bermúdez et al. HOMA2-IR thresholds in a Venezuelan population. 2014.
- Aliyu et al. Evaluating insulin resistance indices in Qatar Biobank. 2025.
- NICE PH38: preventing type 2 diabetes in people at high risk. Definitions and blood test thresholds.
Patient information supporting, rather than replacing, individual clinical advice.