Dr. Palmer's Article on Liver Enzymes
Four separate liver enzymes are included on most routine laboratory tests. They are- aspartate aminotransferase (AST or SGOT) and alanine aminotransferase (ALT or SGPT), which are known together as transaminases; and alkaline phosphatase (AP) and gamma-glutamyl transferase (GGT), which are known together as cholestatic liver enzymes. Elevations of these enzymes can indicate the presence of liver disease.
The link above takes you to an article that tells you about each of the tests and their values.
For information on Shwachman-Diamond Syndrome check out Shwachman-Diamond America