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AST test

Also called: Aspartate aminotransferase, SGOT

AST is an enzyme found in the liver, muscles, and heart. It's read with ALT to check liver health.

SampleA small tube of blood from a vein in your arm
Fasting?Usually not needed
ResultsOften the same day
Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.

What the test is

It's part of the comprehensive metabolic panel (CMP).

An AST about twice ALT or more can point to alcohol-related liver damage.

Why it's done

  • Routine panels
  • Liver or muscle problems

Getting ready and what happens

  • Avoid hard exercise before the test, if possible.

How the test is done

  • A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.

What the results mean

ResultTypical range for adults
ASTAbout 8 to 48 U/L (labs vary)

Normal ranges vary from lab to lab and can differ by age, sex, and pregnancy. Your report lists your lab's own range next to each result. A result a little outside the range is often not a problem.

High

Can come from liver disease, alcohol, muscle injury or hard exercise, or some medicines.

Questions to ask your provider

  • What do my results mean for me?
  • Do I need to repeat this test or have other tests?

Risks

A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.

Related conditions

Related tests

Sources

Last updated 2026-11-13.