Yes! That's what I wanted to do, the PDM had a different idea.
I thought I understood the calculations, but my insulin action time really is set to 2 hours, so after 1 hour 20 minutes (which is when I entered the BG of 249 and the 7g carbs) my IOB should have dropped from the original 5.80IU on board after 5:01PM to about .60IU. Where did that 3.60IU IOB come from? (I read it from the status screen of the PDM).
Here's the full time line:
0.40IU bolus (should have disappeared by 2:18PM)
BG 187 mg/dl (actually descending)
bolus 1.35IU (correction)
BG 88 mg/dl (notice the rapid descent)
70g cards (the chicken), requires 5.80IU
bolus 4.60IU (1.20IU of the 5.80IU for the meal comes from the correction)
6:23PM: (82 minutes later - IOB should be 5.8 - 82/120*5.8 = 1.84IU).
But the PDM has 3.60IU on board, not 1.84IU! That's actually more like the number it should be subtracting (3.96IU), not the number that remains and it corresponds to a 4 hour (or more) insulin action time, not 2 hours using the calculation on page 143 of the UST400 manual.
The question is, how did the "correction IOB" get to be 0.55IU? At 5:01PM my BG was below the target (100) and so I should have had a negative correction. The 1.35IU correction from 4:46PM should have been cancelled out when it got re-purposed as a meal IOB at 5:01PM and, even if it wasn't, by 6:23PM, 97 minutes later, 1.09IU of that original correction should have been used leaving only 0.25IU, not 0.55IU
Can someone double check my math? I can't see any way of getting 0.55IU out of that timeline.