ALT (Liver)
ALT is a liver enzyme that leaks into the bloodstream when liver cells are under stress — one of the two primary liver-function markers on a standard panel.
Reference range
Watch points
- Critical: at or above 200 U/L
- High: at or above 100 U/L
- Borderline: at or above 60 U/L
Same thresholds apply to men and women in this table.
Why hard-training athletes watch it
Alcohol, certain supplements, and regular NSAID use can all raise ALT independent of training, so a lifter with an elevated reading should review what changed in their supplement stack or drinking habits first.
When to retest
Recheck in 4–6 weeks after removing the most likely contributor (alcohol, a new supplement) before assuming a trend — a single elevated draw is common and often resolves on its own.
Talk to your clinician
Review hepatotoxic supports and alcohol with your clinician, and ask about a recheck in a few weeks. Persistent elevation across two or more draws, not a single reading, is what warrants a clinician conversation about liver health.
Related reading
SomaZeus tracks alt (liver) alongside every other panel, your training, and your nutrition on one timeline — so you see the trend, not just the number. Get your first read →
Reference source: NIH MedlinePlus
This article is for education only and is not medical advice. Reference ranges vary by lab and population — always interpret your own results with a qualified clinician.