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Liver

ALT

A liver enzyme released into the blood when liver cells are stressed or damaged.

Unit U/LTypical adult range < 41 U/L
What it is

A liver enzyme released into the blood when liver cells are stressed or damaged.

Why it matters

It is the most liver-specific of the routine enzymes, and a slow rise is often the first sign of fatty liver.

Reading the number

Mildly raised values are common and frequently harmless. What matters is whether the trend holds across several tests.

What moves it
alcoholrecent intense exercisemedications and supplementsweight changerecent illness
Read alongside
ASTGGTAlkaline phosphataseBilirubin (total)WeightAlbuminCreatine kinaseAmylase
When to raise it

Worth discussing a value that is still above the range on a repeat taken weeks later.

Tracking only, not a diagnosis. The range above is a typical adult reference range — the range printed by the lab that ran your test is the one that applies to you. Discuss anything that concerns you with your doctor.

Also known as

On a report in another language.

A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under ALT.

TGPGPTAlanina AminotransferaseAlaniini aminotransferaasAlanin-Aminotransferase

Track your alt over time.

ALT is one of 165 analytes Vitals Vault charts over time. Import a lab report in any language and this number lands on a timeline only you can read.

Continue with Google
Tracking only. This app is not medical advice. Always discuss results and future analysis with your doctor.

Catalog entry last updated 2026-08-27. Browse all 165 metrics.