GGT
GGT is an enzyme in the liver and bile ducts. It is very sensitive to alcohol and to obstruction/irritation of the bile ducts, so it often helps explain why other liver tests are elevated.
| Rating | Range | What it means |
|---|---|---|
| Good | below 40 U/L | GGT within range. |
| Worth improving | 40 – 60 U/L | Slightly elevated — alcohol/liver; monitor. |
| Talk to a doctor | 60 U/L and above | Elevated — seek advice (liver/bile ducts). |
This marker also has 2 age- or sex-specific range sets in the app — the table shows the general one.
Why it matters
EASL: elevated with alcohol, fatty liver, bile duct issues.
If it’s low
Low GGT has no clinical significance.
If it’s high
Elevated GGT most often indicates the effect of alcohol or fatty liver; it can also indicate bile stasis or certain medications. With abstinence and weight loss it often falls nicely.
What to do
Today: stop or strongly limit alcohol — GGT is very sensitive to it. For fatty liver, weight loss and unsweetened coffee help.
Read together with
ALT · AST · Alkaline phosphatase (ALP) · Bilirubin (total)
Part of the guide: Liver →
Articles about this marker
- Alkaline phosphatase (ALP): what high or low levels meanMarker explained
- Blood biomarkers of metabolic health: what to measure and whyMetabolic health
- Blood chemistry tests: normal values for ALT, AST, GGT, CRP, CK, creatinine and glucoseReading your report
- Fatty liver: what raised liver enzymes mean and what FIB-4 isLiver
- High bilirubin: what it means and how to spot Gilbert's syndromeMarker explained
- Liver tests (ALT, AST, GGT): what they mean and how to help your liverMarker explained
This content is for information only and is not a substitute for medical advice. Talk to your doctor about your results.
Your number, not the average
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