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6. What to Expect

An ALT blood test is similar to any other blood test. A phlebotomist or nurse uses a small needle to take a sample of blood from a vein in the arm. There are no special preparations for an ALT blood test, though since it is often ordered alongside other blood tests, the patient may need to fast for 10 to 12 hours before.

Nurse taking a patient's blood sample at lab. romaset / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.