HOMA-IR normal range: why cutoffs differ
A reference range only helps when it matches the model, assay and population used for your result.
Why there is no single normal HOMA-IR number
Oxford cautions that HOMA values depend on the assays used. A threshold quoted without its method and study context cannot reliably classify everyone.
Source: Oxford HOMA calculator and FAQs (opens in a new tab)
A worked example is not a diagnosis
Fasting glucose 90 mg/dL and insulin 10 µIU/mL produce HOMA1-IR 2.22. This arithmetic does not establish a diagnosis or individual treatment target.
Record the method before comparing results
Check whether the report uses HOMA1 or HOMA2, how insulin was measured, the selected units and the insulin conversion factor. Keep these details with the result.
Source: Wallace et al. · Use and abuse of HOMA, 2004 (opens in a new tab)
What to ask about an unexpected result
Ask which reference applies to the laboratory assay, whether the sampling conditions were suitable, and which diagnostic tests are relevant to your situation.
Source: NIDDK · Diabetes tests and diagnosis (opens in a new tab)
Common follow-up questions
What is a normal HOMA-IR level?
There is no universal normal cutoff. Assays and study populations differ; use an appropriate laboratory or research reference with clinical interpretation.
Source: Oxford HOMA calculator and FAQs (opens in a new tab) · Related calculator → · Link to answer
What is the difference between HOMA1 and HOMA2?
HOMA1 uses simple approximation equations. HOMA2 uses an iterative computer model; its results cannot be reproduced by relabelling the HOMA1 equations.
Source: Oxford HOMA calculator and FAQs (opens in a new tab) · Related calculator → · Link to answer
Why might HOMA results differ between tests?
Fasting conditions, biological variation, and assay differences can change results. Use comparable sampling conditions and discuss meaningful changes with a clinician.
Source: Wallace et al. · Use and abuse of HOMA, 2004 (opens in a new tab) · Related calculator → · Link to answer
Reference-linked educational content. Prepared 22 October 2026; independent medical review is pending.