# RE: [IPk] calculating insulin doses

```Thanks for that! The reason I asked is that I have
woken with bg in the teens this week (just like the
bad old days! Must be the shock of going back to
school - hopefully it will settle back down) and
wasn't sure how much extra to give.
Jenny

--- Elizabeth OShea
<email @ redacted> wrote:
> >Excuse me for being a cynic but this seems a
> ludicrous calculation.
>
> Yes, your insulin dose will vary over the day, but
> most people will have a
> 'typical' day: for example, most weekedays someone
> might use x+/- y units of
> insulin. So someone trying to decide their carb
> ratio can begin by looking
> at what their most typical total daily dose is, and
> then work from there.
>
> There is another half to this rule that's in books
> such as _Stop the
> Rollercoaster_ and _Pumping Insulin_: a table that
> gives similar figures
> based on weight. When trying to determine how much
> one unit will drop your
> BG, you're advised to take the higher of the two
> figures. So, if the 1500
> rule tells you one unit would drop your BG by 3 mmol
> but according to the
> weight chart it would drop your BG by 4 mmol, you're
> weight figure to provide a margin of safety. And
> once you have the
> guideline, you can monitor your results and see if,
> indeed, you need to use
> the lower figure.
>
> These things are guidelines. They're there to give a
> convenient starting
> point. If insulin doses or weight fluctuate
> significantly over a period of
> time, it's also a useful way of readjusting your
> figures. But if you don't
> find it useful, certainly, don't use it.
>
> elizabeth
>
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=====
Jenny Davey
Mathematics Department
Esher College
KT7 0JB
020 8398 0291

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