Alanine aminotransferase (ALT)
Alanine aminotransferase (ALT) is an enzyme found mainly in the liver. It is necessary for the body to function properly. When the liver is damaged, this enzyme is released into the bloodstream, raising ALT levels in the blood.
| What is the purpose of this test? | This test is used for the following reasons:
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| How to prepare? |
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| Reference values* |
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| Associated tests | Related tests include the following: |
| How is it done? | Blood sample, usually taken from a vein in the arm. |
| How long before I get the results? | Results are usually ready in a day. It may take longer to receive your results. |
What does an abnormal test result mean?
High values of ALT:
- Liver damage due to disease (e.g., hepatitis, cirrhosis, mononucleosis) or medication
- Alcohol abuse
Medications that may affect test results
Certain medications may affect test results. Here are a few examples:
- Certain cholesterol medications (e.g., statins)
- Certain antibiotics (e.g., cephalosporins, tetracyclines)
- Acetaminophen
- Chemotherapy
- Methotrexate
- Isotretinoin
Factors that can interfere with test accuracy
Destruction of red blood cells (hemolysis) and intense exercise before the test may cause falsely elevated ALT results.
What you should know before going for this test
When you go in for a blood test or any other medical exam, it's always a good idea to bring a complete list of any prescriptions, over-the-counter medications, or natural health products you're taking. Unless otherwise advised, it's best to take your medications as usual on blood test days. If in doubt, don't hesitate to talk to your healthcare professional.
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The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.