I was hoping I can get some input. Today I used the advanced features to the Ping of EZ Carb and EZ bolus on two meals. Had a couple of numbers that I didn't understand so hoped someone could help.

My son has a Target of 120 and I:C ratio of 10 and ISF of 50.

So he had tested before he ate earlier and was at 76 for a BG. He had 40 carbs for the meal.

So the screen showed the following:

EZ Carb

Carbs 40 g

I:C = 10g

Add BG

Actual 76 mg

Target -120

= -44

IS Factor 50 mg

Show results

Carb 4.00 u

BG -0.88u

IOB --,--

Total 3.10 u

I can't figure out what the BG -0.88 u means and how it was calculated.

I did give my son the bolus for 3.10 u and at his next meal his BG was 119 before eating.

HE had 36 carbs.

The screen showed EZ Carb

Carbs 36

i:C 10

BG Actual 119

Target 120

= 0

IS Factor 50 mg

Results

Carbs 3.60 u

BG - 0.00

IOB: 0.15

Total 3.60.

I would think that the pump would subtract the 0.15 IOB from the 3.60 for a number of 3.45u of bolus yet it showed a bolus of 3.60 and seemed to ignoe the IOB.

What am I missing

Thanks guys