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An alanine aminotransferase (ALT) blood test is a laboratory test that measures the level of the enzyme ALT in the blood. ALT is an enzyme that is found in liver cells and is responsible for breaking down proteins. The test is typically ordered to help diagnose liver damage or disease, or to monitor the effectiveness of treatment for these conditions. Elevated levels of ALT in the blood may indicate liver damage or inflammation, while normal or slightly elevated levels may be due to other factors such as strenuous exercise or the use of certain medications.
The ALT blood test is performed on a blood sample taken from a vein in the arm.
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