Alanine Aminotransferase (ALT)
- Sample Type
- Standard
- Fasting
- No
- Unit
- U/L
Alanine Aminotransferase (ALT) is an enzyme found predominantly in the hepatocytes. In a Liver Function Test (LFT), ALT is considered a more specific indicator of liver injury than AST. It is released into the bloodstream when liver cells are damaged or die. It is critical for screening for hepatitis, fatty liver disease (NAFLD/NASH), and drug-induced liver injury (DILI).
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Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
ALT levels fluctuate based on Body Mass Index (BMI), muscle mass, and even time of day. Intense physical activity or the use of certain herbal supplements can cause transient elevations that may be misinterpreted as primary liver pathology.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Alanine Aminotransferase (ALT):
Official Sources
- ALT Blood Test: MedlinePlus Medical TestMedlinePlus
- Alanine Aminotransferase (ALT) - Testing.comTesting.com
Research & Guidelines
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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