Ever have a perfect antecubital vanish the second your 23G butterfly gets within an inch at 5:45 a.m? I swear the tourniquet smirked while I pretended it was all part of the plan.
Ever try a warm pack? I lower the arm, re-tie TQ, and go shallower on 23G at ‘5:45 a.m.’.
I “crack the vac” with a 23G butterfly at 5:45 a.m. — slide the tube in just halfway for the first few drops, then seat it fully once the vein proves it can handle the pull. Saves those sleepy antecubitals from the tourniquet-smirk vanish; you good using tubes for that, @OP?