Interpret Your Alanine Aminotransferase Results
Enter your ALT value below and get an instant, free AI interpretation — a plain-English explanation checked against WHO/IFCC reference ranges.
Medical Disclaimer
This AI-generated interpretation is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Results may vary based on individual health factors not captured here.
Always consult a qualified healthcare professional before making any health decisions. Read full disclaimer →
Alanine Aminotransferase Normal Ranges
ALT is an enzyme found predominantly in liver cells (hepatocytes).
| 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.
Why Doctors Order the Alanine Aminotransferase Test
ALT is the gold standard for detecting acute and chronic liver injury. It is used to screen for viral hepatitis, monitor hepatotoxicity from medications, and evaluate fatty liver disease (NAFLD/MASH).
How to Enter Your ALT Result
Alanine Aminotransferase can be reported in U/L or IU/L. Choose the unit printed next to your result on the lab report so it is compared with the matching reference range.
Reference ranges for ALT differ between men and women, so entering your sex gives a more accurate reading.
What a Low or High ALT Can Be Associated With
Below the reference range
- Not clinically significant (low ALT is normal)
- End-stage liver disease (liver has lost mass, less enzyme present)
- Hemodialysis (enzyme cleared)
Above the reference range
- Viral hepatitis (A, B, C, E)
- Non-alcoholic fatty liver disease (NAFLD/MASH)
- Alcoholic liver disease
- Drug-induced liver injury (statins, paracetamol overdose, antibiotics)
- Autoimmune hepatitis
These are common associations, not a diagnosis. A single result is read alongside your symptoms, history and other tests — discuss it with your doctor.
What Can Change Your ALT Result
Before you read too much into a result, consider whether any of these applied:
- Strenuous exercise (raises ALT from muscle)
- Obesity (elevates ALT through fatty liver)
- Hemolysis in sample (falsely elevates result)
- Medications: statins, paracetamol, NSAIDs, antibiotics, herbal supplements
Preparing for the test: No fasting strictly required, but fasting for 8 hours reduces variability. Avoid heavy exercise 24–48 hours before testing (exercise releases ALT from muscle).
Symptoms That Often Prompt ALT Testing
- Jaundice (yellow skin and eyes)
- Fatigue and malaise
- Nausea and vomiting
- Right upper abdominal pain
- Dark urine
Want the full clinical guide to Alanine Aminotransferase?
Reference ranges, causes, symptoms, preparation, and FAQs.