The following matters should be noted before the liver function test: 1. fasting test, the day before the liver function test dinner should avoid drinking alcohol, do not eat high-fat, high-protein food, do not eat after 9 pm, the day of the test can not eat breakfast, liver function test should be fasting blood draw, fasting time is generally 8-12 hours; 2. prohibit strenuous activities, the morning of the liver function test, can not be physical exercise or strenuous exercise 3, try to avoid doing liver function test during intravenous infusion or within 4 hours of medication, if physical condition allows, it is better to stop medication 3-5 days before doing liver function test, usually the higher the dose of medication, the shorter the interval, the greater the interference with liver function results; 4, if the patient has a cold, it is better to do the test 7 days after the cold is cured, because If the patient has a cold, it is better to do the test 7 days after the cold is cured, because the cold may affect the liver function test results; 5. Do not consume foods rich in carotene and lutein. Consuming foods rich in carotene and lutein the day before the liver function test will make the blood yellow and affect the jaundice index measurement results; 6.