A good insulin resistance score depends on which test you’re looking at, but the most common measure, called HOMA-IR, should ideally fall below 1.4. A score under 1.0 is considered excellent, scores between 1.0 and 1.4 suggest normal insulin function, and anything above 2.0 raises concern for meaningful insulin resistance that could progress toward type 2 diabetes.
The tricky part is that there’s no single universal “insulin resistance score.” Several different tests estimate how well your body responds to insulin, each with its own scale. Here’s how to interpret the most common ones.
HOMA-IR: The Most Common Score
HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) is calculated from two numbers on a basic blood panel: your fasting blood sugar and your fasting insulin level. Your doctor or lab plugs those values into a formula, and out comes a single number.
A large 15-year prospective study in PLOS One identified two key cutoffs. A HOMA-IR of 1.4 was the threshold that best distinguished people with early blood sugar problems from those with normal glucose tolerance. That value lined up almost exactly with the 75th percentile of healthy subjects in the study. A HOMA-IR of 2.0 was the cutoff that best identified people progressing toward type 2 diabetes, corresponding to the 90th percentile of the healthy reference group.
In practical terms:
- Below 1.0: Optimal insulin sensitivity
- 1.0 to 1.4: Normal range
- 1.4 to 2.0: Early insulin resistance, worth monitoring
- Above 2.0: Significant insulin resistance
Keep in mind that these cutoffs were established in a Chinese population and can shift somewhat based on ethnicity, age, and body composition. But they’re widely used as a general reference in clinical research.
Fasting Insulin on Its Own
Sometimes you’ll get a fasting insulin result without a HOMA-IR calculation. There are no formal clinical guidelines defining a “normal” fasting insulin level, which is part of why this area can feel confusing. However, the general consensus among metabolic health practitioners is that fasting insulin below 10 uIU/mL is a good target. Levels above 40 uIU/mL are considered a strong signal of insulin resistance.
Many people focused on metabolic optimization aim for fasting insulin in the 2 to 6 uIU/mL range, though values in single digits are broadly reassuring. If your fasting insulin is creeping into the teens or twenties, your body is likely producing extra insulin to keep blood sugar in check, a sign that cells are becoming less responsive.
The Triglyceride-to-HDL Ratio
You don’t always need a specialized test. Your standard cholesterol panel contains a surprisingly useful proxy for insulin resistance: the ratio of your triglycerides to your HDL cholesterol. Simply divide your triglyceride number by your HDL number (both in mg/dL).
Research published in Biomedicines found that average cutoffs for this ratio are 2.5 for women and 2.8 for men. Staying below those numbers suggests healthy insulin function. These thresholds hold up across different weights and ages, making this one of the most accessible screening tools available.
Ethnicity matters here too. For African Americans, the suggested cutoffs are lower: 1.5 for women and 2.0 for men. For Caucasians and Mexican Americans, the threshold is closer to 3.0. If your ratio is above the relevant cutoff for your demographic, it’s worth investigating further.
The LP-IR Score
Some advanced lipid panels report a Lipoprotein Insulin Resistance (LP-IR) score on a scale of 0 to 100. This test looks at the size and concentration of lipoprotein particles in your blood, which shift in characteristic ways as insulin resistance develops.
Scores are typically grouped into four ranges: 0 to 20 (low risk), 21 to 40 (mild), 41 to 60 (moderate), and above 60 (high risk). A score in the 0 to 20 range is what you’re aiming for. This test isn’t part of a standard panel, so you’d need to specifically request it or get it through a specialized lab.
Glucose Tolerance Testing
An oral glucose tolerance test (OGTT) measures how your body handles a large dose of sugar in real time, rather than estimating resistance from fasting values alone. You drink a glucose solution and have your blood sugar checked two hours later.
A healthy two-hour blood sugar reading is below 140 mg/dL. A result between 140 and 199 mg/dL falls in the prediabetes range. At 200 mg/dL or higher, the result suggests diabetes. While this test doesn’t produce a single “insulin resistance score,” it reveals how effectively your body clears sugar from the bloodstream, which is ultimately what insulin resistance is about.
Some providers also measure insulin levels at the one-hour and two-hour marks during the OGTT. A person with early insulin resistance may show normal glucose readings but significantly elevated insulin, meaning their pancreas is working overtime to compensate. This pattern can show up years before blood sugar itself becomes abnormal.
Why Scores Vary for Certain Conditions
If you have polycystic ovary syndrome (PCOS), you might be looking for a specific insulin resistance cutoff that applies to your situation. Unfortunately, the research here is frustrating. A review in Endocrine Connections concluded that it’s currently not possible to define a universal cutoff for insulin resistance in PCOS, or even to select the single best method for measuring it. Fasting-based indices like HOMA-IR and OGTT-derived measures often don’t correlate well with each other, even when they use the same raw data.
The original research defining insulin resistance in PCOS didn’t rely on a specific score. Instead, it compared women with PCOS to weight-matched peers without the condition and found that the PCOS group consistently showed reduced insulin sensitivity. This means that for PCOS, the trend matters more than any single number. If your scores are rising over time or sit toward the higher end of “normal,” that context is more informative than any individual reading.
How to Improve Your Score
Insulin resistance is one of the most modifiable metabolic markers. Exercise is the most potent tool available. A systematic review and meta-analysis in Frontiers in Endocrinology compared nine different types of exercise and found that combining aerobic exercise with running was the most effective approach for reducing HOMA-IR scores. Cycling ranked highest for lowering fasting insulin levels specifically. Combined aerobic and resistance training also showed meaningful benefits, with meta-analyses confirming it outperformed single-type exercise programs.
Weight loss amplifies these effects. Even a modest reduction of 5 to 7 percent of body weight (about 10 to 15 pounds for someone weighing 200 pounds) can substantially improve insulin sensitivity. The mechanism is straightforward: excess fat tissue, particularly around the midsection, actively interferes with insulin signaling. As that fat decreases, cells become more responsive again.
Sleep and stress also play direct roles. Chronic sleep deprivation, even just a few nights of short sleep, measurably increases insulin resistance. Sustained psychological stress raises cortisol, which in turn raises blood sugar and forces the pancreas to produce more insulin. Addressing these factors won’t show up on a lab report as dramatically as exercise, but they create the metabolic environment that makes or breaks long-term progress.
If you’re tracking your score over time, retest every three to six months after making changes. HOMA-IR and fasting insulin respond relatively quickly to lifestyle shifts, so you should see movement within that window if your interventions are working.