GPT and hepatitis A virus infection: The peak median AST (aspartate aminotransferase) levels were four times the upper limit of normal (ULN) (inter quartile range (IQR) 2-8 times) and the peak median ALT (alanine aminotransferase) levels were seven times the ULN (IQR 3-18 times) among the 33 who were tested because of abnormal liver function tests or development of hepatitis symptoms.