---
title: "Fasting Plasma Glucose (FPG) Optimal Range vs Lab Normal (2026 Clinical Decoder & Protocol) | Nutrition Research Labs"
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description: "Decode your Fasting Plasma Glucose (FPG) (Fasting Glucose) blood test: Longevity Optimal Target (72–86 mg/dL) vs Standard Lab Normal (65–99 mg/dL), assay interference, and Grade-A clinical protocols."
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> **Canonical Source:** [https://nutritionresearchlabs.com/biomarkers/fasting-glucose](https://nutritionresearchlabs.com/biomarkers/fasting-glucose)
>
> *Decode your Fasting Plasma Glucose (FPG) (Fasting Glucose) blood test: Longevity Optimal Target (72–86 mg/dL) vs Standard Lab Normal (65–99 mg/dL), assay interference, and Grade-A clinical protocols.*

## Reference Range Comparison (mg/dL)

- **Longevity & Metabolic Optimal Range:** 72 – 86 mg/dL
- **Standard Lab Reference Interval ("Normal"):** 65 – 99 mg/dL
- **Why Standard Lab Ranges Mislead Patients:** The American Diabetes Association labels anything under 100 mg/dL as
- **Pre-Draw Supplement Assay Interference Warning:** Glycolysis in unspun red blood cells lowers glucose concentration by 5-7% per hour at room temperature. Testing must utilize sodium fluoride / potassium oxalate tubes or prompt plasma centrifugation.

## Decode the Next Biomarker on Your Blood Panel

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