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Clinical validation of the quick dynamic insulin sensitivity test.
Paul D Docherty1, Juliet E Berkeley, Thomas F Lotz
1Centre for Bioengineering, University of Canterbury, Christchurch 8140, New Zealand. paul.docherty@canterbury.ac.nz
IEEE Transactions on Bio-Medical Engineering
|December 13, 2012
Summary
The quick dynamic insulin sensitivity test (DISTq) provides immediate, inexpensive insulin sensitivity (SI) results comparable to the gold standard euglycaemic clamp. This novel method enables wider clinical applications for assessing metabolic health.
Area of Science:
- Endocrinology
- Metabolic Research
- Clinical Diagnostics
Background:
- Insulin sensitivity (SI) is crucial for metabolic health.
- Established methods like the euglycaemic clamp are time-consuming and costly.
- A rapid, cost-effective SI test is needed for broader clinical use.
Purpose of the Study:
- To evaluate the accuracy and feasibility of the quick dynamic insulin sensitivity test (DISTq) compared to the gold standard euglycaemic clamp (EIC).
- To assess two variants of the DISTq protocol (four-sample and two-sample).
Main Methods:
- Fifty participants underwent both EIC and DISTq testing within eight days.
- DISTq involves intravenous glucose and insulin boluses with timed glucose measurements.
- Statistical analyses included correlation, Bland-Altman, and receiver operator curve analyses.
Main Results:
- DISTq and its two-sample variant (DISTq30) showed strong correlation with EIC SI values (R=0.76, R=0.75; c-index=0.84, c-index=0.85).
- Median differences in SI values were 13% (DISTq) and 22% (DISTq30) compared to EIC.
- The DISTq method accurately predicted insulin responses without requiring insulin assays.
Conclusions:
- The DISTq test offers a rapid, inexpensive, and relatively accurate method for determining insulin sensitivity.
- DISTq demonstrates high equivalence to EIC, making it a viable alternative for clinical assessment.
- The test's efficiency can facilitate new applications in metabolic health monitoring.
