Low Alanine Aminotransferase (ALT): what it means
A Alanine Aminotransferase (ALT) result below the normal range is considered low. Here is what a reduced Alanine Aminotransferase (ALT) can point to, and when it is worth discussing with a doctor.
Reference range: Approximately 7–40 U/L; lab-specific
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What a low Alanine Aminotransferase (ALT) can mean
- Vitamin B6 deficiency — ALT requires pyridoxal phosphate as cofactor.
- Severe end-stage liver disease — few remaining hepatocytes left to release the enzyme.
- Most low ALT readings are benign and don't need investigation.
When to discuss with a doctor
ALT >3× the upper reference limit, or any persistent elevation, warrants a primary-care visit and follow-up labs (AST, GGT, alkaline phosphatase, bilirubin, viral hepatitis serology, abdominal ultrasound). ALT >1000 U/L is acute liver injury and needs same-day evaluation. Mediora.AI flags critical values inside your report.
How to raise a low Alanine Aminotransferase (ALT)
A low Alanine Aminotransferase (ALT) is not raised by diet or habits. It reflects something else going on, so what actually helps is finding that cause with a doctor - the value follows once the cause is addressed.
General information, not a treatment plan - decisions about medication or target values belong with your doctor.
Conditions this can relate to
Keep reading
One value is a snapshot. Upload the full test to see every marker explained together.
Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.