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Comparative evaluation of simple insulin sensitivity methods based on the oral glucose tolerance test
A Mari1, G Pacini, A R Brazzale
1Metabolic Modelling Unit, Institute of Biomedical Engineering, National Research Council, Padova, Italy. andrea.mari@isib.cnr.it
Diabetologia
|March 4, 2005
Summary
Five insulin sensitivity (IS) methods were compared to the gold standard clamp. The Oral Glucose Insulin Sensitivity (OGIS) and MCRest methods best reproduced relationships with IS correlates, outperforming HOMA.
Area of Science:
- Endocrinology and Metabolism
- Clinical Diagnostics
- Human Physiology
Background:
- Accurate assessment of insulin sensitivity (IS) is crucial for understanding metabolic health and diagnosing conditions like type 2 diabetes.
- The euglycaemic-hyperinsulinaemic clamp is the gold standard for measuring IS but is complex and time-consuming.
- Simpler surrogate methods are needed for routine clinical and research applications.
Purpose of the Study:
- To compare the accuracy of five surrogate insulin sensitivity (IS) methods against the gold standard euglycaemic-hyperinsulinaemic clamp.
- To evaluate the ability of these surrogate methods to reproduce established relationships between IS and key metabolic correlates.
- To identify the most reliable surrogate IS methods for clinical and research use.
Main Methods:
- Compared five IS methods: Homeostasis Model Assessment (HOMA), Oral Glucose Insulin Sensitivity (OGIS), MCRest, ISIcomp, and SIORAL.
- Used the M value from a euglycaemic-hyperinsulinaemic clamp as the reference standard in 147 women aged 58-61 years.
- Assessed correlations with the clamp M value and used a discrepancy index (D) to evaluate the reproduction of relationships with IS correlates (BMI, fasting insulin, glucose/insulin ratios, fasting/2h glucose).
Main Results:
- All tested IS methods showed significant correlation with the clamp M value (r=0.57-0.83, p<0.0001).
- The Oral Glucose Insulin Sensitivity (OGIS) and MCRest methods demonstrated the best performance, with fewer discrepancies (D≠0) in reproducing relationships with IS correlates.
- The Homeostasis Model Assessment (HOMA) and ISIcomp methods showed significant overestimation or underestimation of correlations, particularly with fasting insulin and BMI.
Conclusions:
- While all surrogate IS methods correlate with the clamp, OGIS and MCRest are superior for accurately reflecting IS-related physiological variables.
- These findings suggest OGIS and MCRest are more reliable alternatives to the clamp than HOMA for assessing insulin sensitivity in women.
- The study highlights the importance of validating surrogate IS methods against established correlates to ensure their clinical utility.