Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Nonalcoholic Steatohepatitis ?
    ### Response:
    NASH is usually first suspected in a person who is found to have elevations in liver tests that are included in routine blood test panels, such as alanine aminotransferase (ALT) or aspartate aminotransferase (AST). When further evaluation shows no apparent reason for liver disease (such as medications, viral hepatitis, or excessive use of alcohol) and when x rays or imaging studies of the liver show fat, NASH is suspected.
    