I usually use my rule of thumb and focus attention on the liver enzyme (ALT, AST or GGT) that is most elevated:
SGOT/AST increased above SGPT/ALT and GGTP
Problem or area of involvement is possible outside the liver and biliary tree (i.e. the heart, muscle, kidneys)
SGPT/ALT increased above SGOT/AST and GGTP
Problem or area of involvement is possible inside the liver itself
GGTP increased above SGPT/ALT and SGOT/AST
Problem or area of involvement is possible outside the liver but inside the biliary tree (i.e. gall bladder, common bile duct and pancreas)