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[IP] Re: Unused insulin rule
Sorry...I responded to this, but accidently send it with the digest
attached, so it bounced. I'm sending it again...
> How exactly did you test to find what your individual unused insulin
>I'm mean I know most of us have gotten a general idea from experience
>there a more precise way?
You have to do it several times to tweek it. But here's what you do in
general. First, make sure your basal rate is correct. :-)
Second, at a time that you don't eat any carbs or protein (nor have you
eaten any in the past several hours nor given any boluses), you give a
correction for a high. (Yes, you have to have a high to do this.)
Then, test your BG level several times over the course of the next 4
hours. Obviously, the more often you test, the more accurate you get.
Perhaps once every 30 minutes???
You can chart each reading as your BG comes down, paying attention to
when you have come down all the way (as in, there is little/no change
in BG). It is during that time that you know that the insulin is
done. For me, that is around the 3.3 hour mark (which is pretty
consistant with the standard unused insulin rules I've seen elsewhere
Okay, then take a percentage of the drop in each "zone" (each 30
minutes) of the overall drop, and apply the same percentage to your
insulin used. For example, if you drop a total of 50 mg/dL from taking
1 unit, but in the first hour you drop 30...then after one hour, you
have used 60% of your insulin. (This is a made-up number to
Of course, doing this once isn't good enough, because different times
of the day, activity, etc., can affect the number...so you need to do
this several times, and kind of average your results.
The end result is a pretty accurate unused-insulin rule for yourself
that works MOST of the time fairly accurately. (I don't think it is
possible to ever be perfect.)
It is important to keep in mind that in the first hour or so, using the
unused insulin rule after eating is not a good idea, because there are
still carbs getting into the body. But after about an hour, the rule
will work pretty well.
At this time, my software only supports 2 "slopes" for the unused
insulin rule, so I have gotten it set to calculate that 85% of the
insulin is gone after the first 1.8 hours (or, 55% of 3.3 hours). This
matches my own curve pretty well. In the future, I may allow for more
customization of the unused insulin to be even more accurate.
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