Alanine aminotransferase 6 U/L indicates that alanine aminotransferase is in the normal range. Alanine aminotransferase is one of the enzymes in the liver, and the results of a fasting blood test can reflect whether or not the liver has been damaged, with a normal range of 0 to 40 U/L. In this case, the patient’s alanine aminotransferase was 6 U/L, which is basically at normal level, so there is no need to worry too much. Only when the value of aminotransferase appears to be elevated does it mean that there is some abnormality in the liver and some degree of damage to liver function. Therefore, if you suspect that your liver has been damaged, you should improve the relevant examinations to make a clear diagnosis, and you should not judge on your own based on the single test result of alanine aminotransferase.