Ive never noticed it with my Minimed. Usually for me my post site change numbers are better, fresher insulin being infused. I tend to get higer around 3 1/2-4 days.
I'm on a Ping and always go high after site changes. I do a little 0.5 unit bolus when I change sites and still go high for a few hours immediately after changing it, often will even get some ketones. It's almost like there's a little interruption in insulin absorption or something. Once the high comes down I get great numbers with a new site.
I was talking to my CDE about it and she says it's pretty common to go high after site changes. She recommended keeping the old site in for a few hours, which I do as well.
Nope, in fact, usually my post-site change numbers are better what with the fresh insulin and all. Like Christy, I see my highs emerge after I've been wearing the same site for more than 3 days. Sometimes I can get a fully 4 days out of a site, but anything after that is usually high city. I think it's a combo of poorer absorption and less fresh insulin.
Yes, I often go high after set changes. I used to always change my infusion sets first thing in the morning and never figured out that some of my occasional post-breakfast spikes were related to set changes.
What I try to do now is change the site mid-morning after my post-breakfast exercise when I tend to start going low. Or maybe in the afternoon if I'm tending low. For me it works best to change the site when my insulin needs are at a minimum.
I use Silhouettes that ask for a .7 fixed prime. I usually do 1.0, but I'm not convinced that's enough if I do it near mealtime. I've read of people who bolus 5 units every time they change an infusion set. That would be excessive for me, but it certainly indicates that you're not alone in your problem.