---
title: "Gamma-Glutamyl Transferase (GGT) Optimal Range vs Lab Normal (2026 Clinical Decoder & Protocol) | Nutrition Research Labs"
source_url: "https://nutritionresearchlabs.com/biomarkers/ggt-liver"
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description: "Decode your Gamma-Glutamyl Transferase (GGT) (GGT) blood test: Longevity Optimal Target (8–18 U/L) vs Standard Lab Normal (9–48 U/L), assay interference, and Grade-A clinical protocols."
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> **Canonical Source:** [https://nutritionresearchlabs.com/biomarkers/ggt-liver](https://nutritionresearchlabs.com/biomarkers/ggt-liver)
>
> *Decode your Gamma-Glutamyl Transferase (GGT) (GGT) blood test: Longevity Optimal Target (8–18 U/L) vs Standard Lab Normal (9–48 U/L), assay interference, and Grade-A clinical protocols.*

## Reference Range Comparison (U/L)

- **Longevity & Metabolic Optimal Range:** 8 – 18 U/L
- **Standard Lab Reference Interval ("Normal"):** 9 – 48 U/L
- **Why Standard Lab Ranges Mislead Patients:** Labs consider values up to 48-60 U/L normal. However, epidemiological studies tracking all-cause mortality, coronary heart disease, and metabolic syndrome demonstrate a significant linear risk increase above 18-20 U/L.
- **Pre-Draw Supplement Assay Interference Warning:** Alcohol intake even in moderate social amounts within 48 hours induces microsomal hepatic GGT synthesis, transiently doubling or tripling serum values.

## Decode the Next Biomarker on Your Blood Panel

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