I don't know, Dexcom G7 is accurate enough. I do random tests from finger and it's about there a bit off but close. The previous versions were wildly off if you're having a hyperglycemia, and also G7 doesn't peak as high as measured from a finger. But in that level you already have ketones in your blood, and insulin resistance, and a bit extra insulin from the pump will not drop you to hypo.