🔬 Biomarkers & DiagnosticsUpdated: September 2, 2026

Metabolic Biomarker Profiling: Fasting Insulin, HOMA-IR & Glycemic Variability

Reviewed by Integrative Medicine & Clinical Nutrition Faculty Board

Clinical Overview

Diagnosing occult insulin resistance years before type 2 diabetes onset: fasting insulin targets (<5 uIU/mL), HOMA-IR scoring, and continuous glucose monitoring.

Fasting blood glucose and HbA1c frequently remain in normal ranges for decades while compensatory hyperinsulinemia drives silent systemic vascular damage and metabolic dysfunction.

1. Functional Metabolic Targets

Metabolic BiomarkerStandard Lab RangeOptimal Functional TargetClinical Significance
Fasting Insulin2.6 – 24.9 μIU/mL2.0 – 5.0 μIU/mLEarliest biomarker of hyperinsulinemia
HOMA-IR Score< 2.0< 1.0 (Optimal)$$\frac{\text{Glucose} \times \text{Insulin}}{405}$$
HbA1c< 5.7%4.8% – 5.2%90-day average erythrocyte glycation
Triglyceride/HDL Ratio< 3.5< 1.5 (< 1.0 ideal)Proxy for small dense LDL particles
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Integrative Medicine & Clinical Nutrition Faculty Board

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