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biochemistryHas Critical Values
Alanine Aminotransferase
ALT· also: SGPT
Clinical Overview
ALT is a liver enzyme that leaks into the blood when liver cells are damaged. It is the most specific marker for liver damage, elevated in hepatitis, fatty liver, and drug-induced liver injury.
Reference RangesWHO/IFCC standards
| Age Group | Sex | Reference Range | Unit | Notes |
|---|---|---|---|---|
| Adults (18–64) | Male | 7 – 56 | U/L | — |
| Adults (18–64) | Female | 7 – 45 | U/L | — |
Also reported in: IU/L.
Critical (Panic) Values
Critical High: > 1000 U/L. Values outside these limits require immediate clinical attention.
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Related Topics
liverhepatitisLFTfatty liver