My GGT was recently shown to be elevated in my latest blood test. GGT was 197, ALT was 65, AST was 24, and ALK Pho was 137. I am 66 years old, non-drinker, and non-smoker. I did pass a kidney stone a couple of weeks before this blood test. Should I be worried, and what would cause this spike in my GGT? Thank you