The procedure for liver function tests is as follows. The patient should not eat any food or drink any water 8 hours or more before the test. Try to eat a light diet the day before the test to avoid affecting the test results. A small needle is usually used to take a blood sample from the patient’s body, which is then sent to a pathology lab for analysis and testing. Typical liver function tests include total protein, globulin, albumin, direct bilirubin, total bilirubin, ghrelin, ghrelin, and cholinesterase. By testing the levels of these substances in a patient’s blood sample, a preliminary diagnosis can be made as to whether the patient’s liver is likely to be diseased. However, the specific type of disease needs to be combined with the actual symptoms of the patient and a more detailed special examination to make a clear diagnosis.