Usually whenever I get my saxes set up ready to play, I check (by playing) the following notes: C to C#, G to G# and C2 to C#2 (this last one is rarely mentioned, but I had a problem and it confounded the tech for a while too - the pad just above the B pad near the neck of the sax had managed to stick down. Given it is a "normally open" pad, it lead us all a merry dance until we finally spotted the problem I wasn't getting a C# of the no-fingers variety!
I also check all the other "pinkie-table" keys too.
Once I've blown all those notes, the sax has got warmer, the little fingers are ready for the off and (hopefully) there are no sticking pads.