Yeah, traditionally this includes the crema though more and more specialty coffee nerds are opting aways from the shot glass, and towards the scales as the ammount of crema (and therefor total volume of the shot) changes masively from blend to blend, day to day, and shot to shot. Throw in a naked portafilter and the whole equation is thrown out of whack. But for simmplicity, yeah, 30mls includes the crema