Fatty Liver Fieldguide · Answer guide
Can you have fatty liver with normal ALT and AST?
Yes. Normal ALT and AST do not rule out fatty liver or clinically important fibrosis. These blood tests reflect aspects of liver-cell injury; they do not directly measure liver fat or provide a complete scar-tissue assessment. An imaging finding and normal enzymes can therefore coexist.
Evidence behind this answer
Sources checked November 1, 2026: [1] AASLD clinical assessment and management guidance, 2023[2] NIDDK: diagnosis and tests
Why the two results are not a contradiction
Imagine that an ultrasound report describes fat in the liver while a blood panel labels ALT “normal.” The ultrasound is looking at an imaging characteristic; the enzyme result is a measurement in blood at a particular time. They are not competing answers to the same question. Neither result should be discarded just because the other looks reassuring. The next step depends on the whole clinical picture, including metabolic risks, alcohol exposure and other possible causes of liver disease.
What ALT and AST can—and cannot—tell you
Elevations can prompt an evaluation, but they are not specific to one diagnosis. Conversely, normal aminotransferases are not a dependable way to exclude advanced disease in someone at risk. A laboratory reference interval also is not a personalized verdict about liver health. AASLD guidance specifically cautions against using these enzymes alone to exclude clinically significant fibrosis. It is more useful to ask what additional assessment is indicated than to assume that a normal flag means no follow-up is needed.
How clinicians assess scarring
Depending on the situation, a clinician may use a blood-based risk score, elastography or another assessment. FIB-4 uses age and routine blood results; elastography assesses liver stiffness. Their interpretation has boundaries, including age, illness and the circumstances in which they are used. An ordinary ultrasound reporting fat does not itself establish a fibrosis stage. This site does not turn one set of numbers into a diagnosis or recommend a particular scan for everyone.
What to do with an incidental finding
Keep the actual report and laboratory results, including dates and units. Follow up with the clinician who ordered the test or your usual care team. Clarify whether the finding needs metabolic risk assessment, review of other liver causes, a fibrosis evaluation or ongoing observation. Do not stop prescribed medication or begin a supplement simply to change a laboratory number. If new or concerning symptoms occur, seek clinical assessment rather than waiting for the next routine test.
Related questions
Does a normal ALT mean there is no MASH?
No. ALT alone cannot establish or exclude MASH, and it cannot reliably stage fibrosis. The diagnosis is made using appropriate clinical assessment and, in some circumstances, additional tests.
Does an ultrasound measure liver scarring?
Routine ultrasound can identify features consistent with liver fat but is not the same as an elastography-based stiffness assessment or a liver biopsy. Read the name of the actual test before interpreting the result.
Sources
General information, not an individual diagnosis or treatment plan. Product-specific approval, risks and eligibility must be checked against the current label and clinical assessment. How we publish · Report a correction