Quantifying Insulin Resistance with HOMA-IR

HOMA-IR was developed by Matthews et al. in 1985 as a simplified model of the glucose-insulin feedback loop. The formula (fasting insulin x fasting glucose / 405) produces a dimensionless index that correlates well with the gold-standard hyperinsulinemic-euglycemic clamp test. By combining both insulin and glucose into one number, HOMA-IR captures the full picture: high insulin with normal glucose (early resistance), high insulin with high glucose (advanced resistance), or normal insulin with normal glucose (good sensitivity).

1

Better Than Either Alone

HOMA-IR provides more information than fasting insulin or fasting glucose measured independently, because it captures the relationship between the two.

2

Track Over Time

HOMA-IR is excellent for monitoring the effectiveness of lifestyle interventions. A declining HOMA-IR confirms improving insulin sensitivity.

Optimal HOMA-IR Benchmarks

Functional Range (Metabolic Focused) Optimal: < 1.0; Acceptable: < 1.5
Standard Lab Range Standard: < 2.0 generally considered normal; > 2.5 indicates significant insulin resistance

Common Questions

How do I calculate HOMA-IR?

HOMA-IR = (Fasting Insulin in uIU/mL x Fasting Glucose in mg/dL) / 405. You need both fasting insulin and fasting glucose from the same blood draw.

What is a good HOMA-IR score?

Below 1.0 is excellent. Between 1.0 and 1.5 is acceptable. Above 2.0 suggests insulin resistance. Above 2.5 is significant insulin resistance.