ALT (SGPT)
ALT (alanine aminotransferase) is an enzyme found mainly in the liver. When liver cells are damaged, ALT is released into the bloodstream, making it a key marker of liver health.
Category: Liver Function
Also known as: alt, sgpt, alanine aminotransferase, alanine transaminase, gpt, Glutamic-pyruvic transferase, alanin aminotransferaza
Reference range: 7–56 U/L (Source: ABIM)
Standard unit: U/L
High values may indicate
High ALT may indicate liver damage from hepatitis, fatty liver disease (NAFLD/NASH), cirrhosis, medication toxicity, or alcohol abuse.
Low values may indicate
Low ALT is generally not a clinical concern. Very low levels may occasionally be associated with vitamin B6 deficiency.
Frequently asked questions
- What is a normal ALT (SGPT) level?
- A typical reference range for ALT (SGPT) is 7–56 U/L (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is ALT (SGPT) measured in?
- ALT (SGPT) is most commonly reported in U/L. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do ALT (SGPT) reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track ALT (SGPT) over time?
- Yes. Upload results from any lab and BloodId charts your ALT (SGPT) over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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