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Glossary

Insulin resistance

Your tissues answering insulin less efficiently than they should, so your body has to make more of it to do the same job. It's almost always estimated rather than measured, and there's no single agreed normal value among the medical community.

In one group of people the threshold for insulin resistance moved from 3.46 to 2.05, and nothing about those people had changed except the statistical rule somebody applied to them. Picture a woman whose result comes back at 2.5. Under one rule she is insulin resistant, and under the other she is unremarkable.

Quick answerInsulin resistance means your tissues answer insulin less efficiently than they should, so your body makes more of it to move your glucose along. It's estimated rather than measured, using a calculation called HOMA-IR. There's no agreed normal value among the medical community.
That missing normal value isn't a hole in the literature waiting to be filled, and knowing why changes how you read your own result. No outcome defines where insulin resistance begins, so somebody has to draw the boundary statistically, and different ways of drawing it land in genuinely different places. In one sample of 2,459 Spanish adults, one rule put the line at 3.46 while another put it at 2.05, from one set of blood tests on one group of people.

What the term describes

Insulin's job is to move glucose out of your blood and into the tissue that needs it, and insulin resistance means that process has started working less efficiently than it should. Your body answers by making more insulin, which for years keeps your glucose where it belongs and keeps everything looking unremarkable from outside. What the phrase describes is a range rather than a condition you either have or don't.

It underlies a range of metabolic problems without ever being a disease in its own right, which is part of why the term gets used so loosely. It appears on a rheumatology site for two reasons worth separating. Inflammatory arthritis seems to come with more of it, and heart risk is raised in nearly every inflammatory rheumatic condition, so metabolic measurements belong in that wider picture whether or not anybody mentions your joints.

Measuring insulin resistance directly needs a research procedure rather than a blood draw, so in ordinary practice it gets estimated. The usual estimate is called HOMA-IR, worked out from a fasting glucose and a fasting insulin taken together. Being an estimate built from two numbers, it inherits whatever affects either of them, including how long you'd really fasted before the needle went in.

Why it appears on a rheumatology site

One study in our sources compared insulin resistance between two autoimmune diseases seen in one clinic, covering 413 people, of whom 227 had rheumatoid arthritis and 186 had lupus. The rheumatoid arthritis patients were more insulin resistant. Insulin sensitivity was lower by 27 points, with the true difference falling somewhere between 9 points and 46 points lower, at a P value of 0.004.

That range is worth understanding, because it's how these studies tell you what they do and don't know. The best estimate is 27 points, and the honest answer is that the real difference lies somewhere between 9 and 46. Since the range never reaches zero, the direction is settled: rheumatoid arthritis patients really were less sensitive, even though how much less is still open.

Those patients also more often met the definition of insulin resistance outright, at odds 2.15 times higher, across a range from 1.25 to 3.69. Beta cell function went the other way, coming out higher in rheumatoid arthritis by 38 points, from 23 to 52, at a P value below 0.001. Everybody in that study was measured at a single moment rather than followed over years, so it shows you a real difference between two groups of patients and leaves the reason to a rheumatologist who knows the person in front of her.

Common misconceptions.

Myth. There's a normal HOMA-IR value I should be under.

Reality. There isn't, and the spread between published thresholds is wide enough to move you from one side of the line to the other. In a group of 2,459 adults, taking the top tenth gave 3.46 while counting the parts of metabolic syndrome gave 2.05, so a woman at 2.5 is resistant under one rule and unremarkable under the other. Splitting by sex and age moved it yet again, which is why a figure quoted without the rule behind it tells you almost nothing.

Myth. A HOMA-IR above the cut-off means I'm diabetic.

Reality. These are two measurements answering two different questions, and one doesn't substitute for the other. HOMA-IR estimates how readily your tissues answer insulin, worked out from a fasting glucose and a fasting insulin, while diabetes is diagnosed on glucose rules instead. Look at where the line falls: every best value in that Spanish study fell between the 70th and 75th percentiles, so being above it puts you with roughly a quarter of all adults rather than in a small, unwell minority.

Myth. This has nothing to do with my arthritis.

Reality. The one study in our sources comparing two autoimmune diseases head to head suggests otherwise, and it covered 413 people. Rheumatoid arthritis patients were more insulin resistant than lupus patients, with insulin sensitivity lower by 27 points and odds of meeting the definition 2.15 times higher. Everybody was measured at a single moment rather than followed over years, so the study shows you a difference and leaves the reason to your rheumatologist.

Myth. The rheumatology figures used a rheumatology threshold.

Reality. They didn't, and the study says so itself, which is why this page raises it rather than quoting the headline and moving on. The definition applied to those 413 patients came from general adults: 1.85 or above in men, and between 2.07 and 2.47 in women depending on age. A line drawn in one population and applied to another can invent a difference or bury one, so the figure of 2.15 means only as much as the threshold behind it.

Related terms.

References.

  1. 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
  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

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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.