ALT (Alanine Aminotransferase) – ALT is an enzyme concentrated in the liver. It’s one of the most specific blood markers of liver-cell stress.
What ALT measures
ALT measures liver health – elevated ALT often points more specifically to the liver than AST does.
Typical ranges
Roughly 7-56 U/L, varying by lab. Reference ranges differ between laboratories and by age and sex, so always read your result against the range printed on your own report.
What high results can mean
Can reflect fatty liver, hepatitis, medication effects, or alcohol – it warrants clinical follow-up.
What low results can mean
Not typically a concern.
How the test is done
A blood sample; often part of a liver or metabolic panel. At-home collection works well for this marker when the sample is processed by a certified lab.
FAQ
What is a normal ALT level?
Roughly 7-56 U/L, varying by lab. Your ideal target depends on your age, sex, and health history, so review results with a clinician.
What does a high ALT result mean?
Can reflect fatty liver, hepatitis, medication effects, or alcohol – it warrants clinical follow-up.
Can I test ALT at home?
Yes. A blood sample; often part of a liver or metabolic panel. An at-home sample processed by a certified lab gives reliable results.
This article is educational and not a substitute for medical advice. Discuss your results with a qualified clinician.