GGT worth pulling or overkill?

GGT is cheap informational value. It catches things ALT/AST miss (biliary issues, alcohol-related changes, some medication effects). Not strictly necessary but worth the $15 once a year. In your routine 2-3x/year pulls, I'd include it in one of them.

Sold. Adding it next time.

I include GGT in every LFT panel I run. The extra number has caught something useful maybe 1 in 15 panels. Good insurance for the price.