I'm a T1 and have labs drawn the week before I go in for visits. I am fairly new to D just a year and a lf since dx at 60,and I'm on pump and CGM. I get seen every 3-4 months alternating between pump nurse and endo. I always get my orders for next set of tests placed by practitioner I see so they are available for review with next visit. They keep track of what needs reviewed based on current numbers and testing protocols.
Also review meter, pump and cgm downloads at visit to see how things are going, see if things need tweaked, see if numbers/insulin requirements are shifting.
My D care is with Endo not with PCP, as they have little to no experience with adult onset T1. I was the first seen/recognised in the practice - not to say that they might not have missed others, especially as I was the one that came in with the list of what to order and twisted arms to get it all done.
Am seen in a large teaching hospital diabetes center in the Philadelphia area with lots of T1 experience.