Tool
HOMA-IR calculator
HOMA-IR is a calculation rather than a measurement, and the line between normal and abnormal was drawn by statisticians rather than by biology. That is worth knowing before anybody acts on a result. Everything solid about the number sits in the arithmetic, and everything uncertain about it sits in the interpretation.
What the research found.
One Spanish study of general adults produced two different thresholds out of one single dataset. One rule took the top tenth of the group and gave 3.46, while another rule counted the parts of metabolic syndrome and gave 2.05. Both of those figures came out of one group of people.
In that study, age and sex moved the threshold again. In men without diabetes it was 1.85, while in women without diabetes aged 70 it was 2.47, and people with diabetes came out at 1.60 and 1.58. So one dataset produced cut-offs running all the way from 1.58 to 3.46.
People with rheumatoid arthritis met the insulin resistance definition more often than people with lupus did. The odds ratio was 2.15, and the true value sits somewhere from 1.25 to 3.69, which is a wide enough spread to notice. The thresholds used in that comparison were the imported Spanish ones.
Quevedo-Abeledo and colleagues, The Journal of Rheumatology, 2020
In that comparison, insulin sensitivity was lower in rheumatoid arthritis than it was in lupus. The beta was minus 27, with the true value sitting somewhere from minus 46 to minus 9, at a P value of 0.004. Those are the two headline findings of the best study the field has.
Quevedo-Abeledo and colleagues, The Journal of Rheumatology, 2020
This calculator does not diagnose anything. It puts a number in context. What the number means for you is a conversation with your clinician.
What the number is
HOMA-IR is a calculation rather than a measurement, and it takes a fasting glucose and a fasting insulin drawn in one sitting. It multiplies them together and divides by a fixed number. The reasoning behind it is simple enough: if your glucose is normal only because your insulin is high, then your tissues are resisting that insulin.
Nothing in that sum is measured directly, which is the first thing worth knowing about any result. What you have is an estimate built out of two other tests, and the quality of the estimate depends on the quality of both. Fasting insulin is the less dependable of the two, which counts for more than people expect.
The calculation itself is reproducible and the interpretation isn't. Give two identical values to any laboratory and you get an identical HOMA-IR back. What that number means, and whether it counts as abnormal at all, is where the whole difficulty starts.
Where the threshold comes from
The study most often cited for HOMA-IR cut-offs looked at general adults in Spain, and it reported something more interesting than a single number. One rule took the top tenth of the group and set the threshold at 3.46. Another rule counted the parts of metabolic syndrome and set it at 2.05, and both figures came out of one group of people.
Splitting by age and sex moved it again. Men without diabetes came out at 1.85 by one method and 2.27 by another, while women without diabetes ran from 2.07 at age 50 to 2.47 at age 70. People with diabetes came out lower still, at 1.60 in men and 1.58 in women.
So one study produced thresholds running from 1.58 to 3.46, and what changed between them was the rule somebody chose. That range is wide enough to put most people on both sides of the line at once, which is why this page won't hand you a single number. The yardstick in that study was the parts of metabolic syndrome, which is a stand-in rather than an outcome.
Why there's no rheumatology answer
No HOMA-IR threshold has been worked out in any rheumatic disease, and that holds across rheumatoid arthritis, lupus, spondyloarthritis, and everything else on this site. It isn't an oversight so much as a study nobody has funded yet. So every rheumatology reader who has been given a target is borrowing one from somewhere else entirely.
The best study in the field makes that point without meaning to. Researchers compared insulin resistance in rheumatoid arthritis and lupus, and they defined it using thresholds imported straight from that Spanish survey, because there was nothing worked out in either disease to use instead. Their finding was that rheumatoid arthritis came with more insulin resistance than lupus, at an odds ratio of 2.15 with a true value somewhere from 1.25 to 3.69. Insulin sensitivity was lower in rheumatoid arthritis too, at a beta of minus 27.
Those results are worth knowing and they don't come with a target attached. The study looked at two groups at one moment, so it describes them side by side rather than describing a sequence of events. Steroids, disease activity, and body composition all move HOMA-IR, and separating them in a study of that design isn't possible.
What to do with a result you already have
A raised HOMA-IR is a reason to look at what moves insulin resistance rather than a diagnosis in itself. Exercise moves it, and so do body composition, sleep, and corticosteroid drugs. Every one of those is worth attention in an inflammatory disease anyway, for reasons that have nothing to do with this number.
Comparing your own value against one from a different laboratory is the mistake most worth avoiding. Laboratories don't all run the insulin test to one method, so identical blood can give different insulin readings in two places, and that gives different HOMA-IR values. Follow your own value at one laboratory over time, because that tells you more than a threshold borrowed from elsewhere ever will.
The most useful question to ask the clinician who ordered it is a short one. Which threshold are you using, and where did it come from? That single question does more work than the result does, because the answer tells you what you are being measured against. It may be a percentile, it may be a metabolic syndrome definition, or it may be a number somebody read on a slide, and all three are in use.
Common misconceptions.
Myth. There's a normal HOMA-IR and mine is above it.
Reality. There are several normals here and they disagree with each other. One Spanish study produced thresholds running from 1.58 to 3.46, and what changed between them was the statistical rule, plus the age and sex of the person being measured. So being above one of those and below another is a common place to find yourself.
Myth. HOMA-IR is a blood test.
Reality. It's a sum done on two blood tests rather than a test in its own right. Those two are a fasting glucose and a fasting insulin, drawn in one sitting, and nothing at all is measured directly here. That's why the insulin test counts so much, and why values don't transfer between labs.
Myth. A high HOMA-IR means I'm heading for diabetes.
Reality. It's a marker of insulin resistance rather than a forecast of a diagnosis. The study most often quoted checked its thresholds against the parts of metabolic syndrome, which are a stand-in rather than an outcome anybody suffers. So a raised value is worth a conversation with your doctor, and it isn't a verdict on anything.
Myth. My rheumatologist can tell me what my HOMA-IR should be.
Reality. Nobody can tell you that, because no threshold has been worked out in any rheumatic disease. Even the best study of insulin resistance in rheumatoid arthritis and lupus borrowed its cut-offs from a survey of general adults in Spain. The authors of that study say so plainly, which is more than most people quoting a target do.
Questions patients ask.
What does HOMA-IR measure?
It estimates how much your tissues are resisting insulin, using a fasting glucose and a fasting insulin drawn at the same time. The logic runs like this: if your glucose stays normal only because your insulin is running high, then your tissues are resisting that insulin. Somebody holding an identical glucose on a low insulin level isn't. The sum multiplies the two values and divides by a fixed number, so nothing is measured directly.
So what's a normal result?
That depends entirely on who is drawing the line, which is the honest answer rather than an evasive one. One Spanish study of general adults gave two thresholds, one rule taking the top tenth and giving 3.46, and another counting the parts of metabolic syndrome and giving 2.05. Age and sex moved it again, to 1.85 in men without diabetes and 2.47 in women without diabetes aged 70. All of those values came out of one dataset.
Is there a threshold for people with autoimmune disease?
No, and that's the single most useful thing on this page. No HOMA-IR cut-off has been worked out in any rheumatic disease, and the best study in the field imported its thresholds from that Spanish survey of general adults. Its authors say so plainly, so anyone quoting you a rheumatology target is quoting a number that doesn't exist.
Does inflammatory arthritis affect insulin resistance?
The evidence points that way without coming with a target attached to it. People with rheumatoid arthritis met the insulin resistance definition more often than people with lupus, at an odds ratio of 2.15, and their insulin sensitivity was lower. That study looked at two groups at one moment, so it describes a link rather than an order of events. Steroids, disease activity, and body weight all move the number, and they're hard to separate from each other.
Can I compare my result to one from a different lab?
Not reliably, and this is the thing that catches people out. Laboratories don't all run the insulin test to one method, so one tube of blood can give different insulin values in two places, which gives different HOMA-IR results. Following your own value at one laboratory over time tells you more than comparing a single number against a threshold from a study somewhere else.
What should I do with a raised result?
Treat it as a reason to look at what moves insulin resistance rather than as a diagnosis in its own right. Exercise moves it, and so do body composition, sleep, and corticosteroids, every one of which is worth attention in an inflammatory disease anyway. Take the number to the clinician who ordered it and ask which threshold they used and why, because the answer tells you more than the value does.
References.
- Gayoso-Diz P; Otero-González A; Rodriguez-Alvarez M et al. Insulin resistance (HOMA-IR) cut-off values and the metabolic syndrome in a general adult population: effect of gender and age: EPIRCE cross-sectional study. BMC Endocrine Disorders. 2013;13. 10.1186/1472-6823-13-47Cross-sectional random population sample of 2
- Quevedo-Abeledo J; Sánchez-Pérez H; Tejera-Segura B et al. Higher Prevalence and Degree of Insulin Resistance in Patients With Rheumatoid Arthritis Than in Patients With Systemic Lupus Erythematosus. The Journal of Rheumatology. 2020;48:339-347. 10.3899/jrheum.200435Cross-sectional study of 413 subjects
This page gathers the published research on this subject into one place. The studies behind it were published between 1989 and 2026, and every figure links to the paper it came from. Those studies were peer reviewed. This summary of them was not. Dr. Sarah Luebker is reviewing these pages one at a time and has not reached this one yet, so it carries no medical review date and nothing here is her opinion or her advice to you. Each page gets updated as she reaches it. It is here in the meantime because the science is worth having in one organized place that is easy to find and easy to read. Talk to your own clinician before acting on any of it.