# [IPk] Divide by 18

```Thanks John

For non mathematical anoraks on the list:

To divide by 18, one way is to divide by 10, then halve what's left and add
a tenth, or watch Countdown.

e.g., If you are at a bg level of 285 mg/dl.

285 / 10 is roughly 28
Halve again gives roughly 14
Add a tenth gives 15.4 mmol/dl.

The actual figure is 15.8.

Julian

> -----Original Message-----
> From: John Neale [mailto:email @ redacted]
> Sent: 26 October 2001 10:50
> To: email @ redacted
> Subject: RE: [IPk] Sliding scale vs. pumps
>
>
> >Would someone clarify what "sliding scale" means.
>
> Thanks for having the courage to ask :-)
>
> I just did a google on "insulin sliding scale" and found this:
>
> http://www.diabetesnet.com/diabetes_control_tips/1800rule.html
>
> (Beware! This is a US site, using US bg units. Divide by 18
> to get UK units)
>
> Essentially it is the pretentious medical name for estimating
> out how far
> so much rapid acting insulin will lower your blood glucose
> level. It's just
> a ratio. Mostly used when you are actively managing your bg
> level. Also
> known as insulin sensitivity factor. Mine is 2.5 mmol/L per unit.
>
> I say estimate, as I believe it is not that accurate. It's all a best
> guess. Many believe that the higher your bg, the less
> sensitive you become
> to insulin - so you need more insulin to reduce your bg from
> 16 to 12 than
> you would need to go from 10 to 6. Why this is so is almost
> Is your body not absorbing very well today? (You inject 4
> units, but only 3
> make it to the blood stream. The other unit is carted off by
> the immune
> system) Is that why your bg is high in the first place? Is it
> absorbing
> very slowly today? (So the insulin will hit you in 6 hours,
> rather than 1)
> Are you going down with a cold so you need more insulin in
> any case? (And
> so the ratio you use may be inappropriate today in any case) Is your
> digestion going slowly today? (So at 7pm your lunch
> carbohydrate is only
> just hitting you). The list of reasons is endless. The
> important thing is
> not to take too much! And be patient.
>
> John
>
> --
> mailto:email @ redacted
> http://www.webshowcase.net/johnneale
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