How reports print it
What it shows
An enzyme found mainly in liver cells. When the cells are damaged, ALT leaks into the blood.
Units and conversion
Base unit: U/L.
- 1 µkat/L = 60 U/L · 1 U/L = 0.01667 µkat/L
Enzyme activity depends on the method and the measuring temperature, so it is not converted between methods. Converting 1 µkat/L = 60 U/L only changes the unit.
Typical ranges
Your laboratory’s range comes first — it is printed on the report next to the result. Below is one laboratory’s adult range with its method: a reference, not a rule.
| Who | Range, U/L |
|---|---|
| Men | < 41 |
| Women | < 33 |
Range source: Лаборатория Хеликс — Аланинаминотрансфераза (АЛТ)
Good to know
Enzyme activity depends on the method and the measuring temperature, so it is not converted between methods. Lab ranges differ, so compare with the range on your own report.
Why it can be higher
Common reasons discussed with a doctor. This is not a diagnosis.
- Fatty changes in the liver
- Alcohol
- Some medicines and supplements
- Viral hepatitis
- Hard strength training the day before
Why it can be lower
- A low ALT activity usually means nothing by itself
What to ask a doctor
- How does ALT fit with AST, GGT and bilirubin?
- Which medicines and supplements can affect it?
- When to repeat it?
Whom to see
A GP or internist; then a gastroenterologist.