My IC ratio fluctuates all over the place, but not drastically. I can’t tell if the pump has resulted in more or less of a ratio because I just leave whetever setting is in my pump as a rough average and hope I don’t have to correct too much either way. I do change them occasionally, but only if they are trending and I’m getting consistent differences in BG readings that can be corrected by changing my IC ratio. So, for example, if I’m missing workouts and I know that I’ll keep missing workouts, i’ll go in and change my IC ratios accordingly.
I did the same thing while on MDI. There doesn’t seem to be much of a difference in my ratios between being on MDI and the pump, honestly.
The difference in bolus amount is probably based on a couple of things, given the fact that i’m using the same IC ratio guestimates:
On MDI, I generally rounded up to the next highest unit, while the pump can just calculate and deliver an exact amount. I’m also having to take less correction boluses on the pump. I’m guessing that’s due to better absorption at the site for the pump. Based upon the boluses I logged on MDI and the bolus amounts dispensed by my pump, I’m looking at about 20% less total amount bolused per day on a pump while using the same given carb ratio guesstimates. It’s not a great amount, the difference between bolusing 9 to 12 units a day on MDI and 7 to 11 units a day on a pump, but it’s a consistent difference.
As for my basal, who knows? I went from using 12 units of lantus a day to between 10 and 11 units of Novalog for my basal needs. Lantus is so screwy, I’m just glad to be off the stuff.