Author: MAI Medical Information Team ·
Updated: 2026-04-15 ·
Reviewed by: Medical Information Team ·
Sources: WHO, UpToDate, PubMed
Liver Function Tests: ALT, AST, Bilirubin Normal Ranges
What Are Liver Function Tests?
Liver function tests (LFTs) are a group of blood tests that assess the health of your liver. Key markers include ALT, AST, bilirubin, GGT, and alkaline phosphatase (ALP).
Normal Ranges
| Marker | Normal (Male) | Normal (Female) | Elevated Indicates |
|---|---|---|---|
| ALT | <41 U/L | <33 U/L | Liver cell damage |
| AST | <40 U/L | <32 U/L | Liver or heart damage |
| Bilirubin | 3.4–17.1 µmol/L | Jaundice, bile duct issues | |
| GGT | <60 U/L | <40 U/L | Alcohol impact, bile issues |
When to Worry?
Mildly elevated levels (up to 2x normal) can be temporary — after alcohol, medications, or intense exercise. If ALT/AST exceeds 3x the normal range or bilirubin is elevated, consult a doctor promptly.
MAI Tip: Upload your liver function test results to MAI — our AI will explain each marker and tell you whether additional tests or a doctor visit are recommended.
⚠️ Important: This article is for informational purposes only and does not constitute medical advice.
Always consult your doctor before making health decisions.
Sources: World Health Organization (WHO), UpToDate Clinical Reference, PubMed Medical Research Database.
Sources: World Health Organization (WHO), UpToDate Clinical Reference, PubMed Medical Research Database.
Related articles
- Blood Test Results Explained: Complete 2026 Guide with Normal Ranges · 2026-04-13
- Hemoglobin Levels: Normal Range, Low & High — What to Do · 2026-04-13
- CRP Test Explained: What It Is, Normal Range & What High CRP Means · 2026-04-13
- Cholesterol Levels: Normal Range, LDL vs HDL & How to Lower It · 2026-04-14