Rounding up or rounding down

I just need some clarification on this - if my lunch comes to 4.5 CPs, then do I round it up to 5? And if so and I am on 1:1.5 ratio, do I then take 7 units or 8?

I'm on the same ratio as you...in the example you give I go for 7 units [4.5 x 1.5 = 6.75 units....rounded up to 7].
Say the number of units had come to 6.5, I round up and would take 7 units

Hi, thanks for that, just wanted to be sure!

Hi Diane,

Me again!

Depending on what insulin you're on - you can get 0.5 unit pens. I'm on Novorapid QA and I have the Novopen 3 Demi which allows me to do that.

If that's no good then I would usually say that I would base it on what my blood sugar reading pre-eating was - so if I was eating 4.5 CPs then I would round it down to 4 if my blood sugar was 5.0 before eating and round it up to 5 if it was 8.0 say.

With me, 0.5 units QA equates to around 1.5mmol BG so you can roughly work it out from there as to where it would bring you to.

M xx

Hallo again!

Yes that's very true, I will just have to see how it goes. I knew you could get 0.5 pens, but in my case I've got insulin resistance so I think 0.5 units would have negligible effect on me.

Thanks anyway

Diane x

The worked example be meltow is exactly how I would do it, multiple by your ratio then round up or down......

Depending on your preference, it could be a good idea to consider you pre meal test when deciding to go up or down.......I personally just use the normal rounding up/down rules regardless of what my BG is at.....

I am quite happy to have my BG at 4.5 - 5 mmol/l.........

You're very lucky - that would almost certainly mean imminent hypo for me!

you must be quite sensitive to insulin, you could try tweaking/compensating with you basal dose...........

done any basal tests recently?

MelissaF, I'm a sensitive half unit pen using diabetic too! With the half unit pen, it makes such a difference with this sort of thing.

On that note, does anyone know if there's a Levemir half unit pen? It's come up every now and then in my mind... I use a humalog half unit pen for meals/corrections.

Yes I'm realising now there's no set rule to rounding up/down. By the way, a packet of Walkers cheese and onion crisps is classed by them as 12.5g and I'm counting as 1 CP. So if I have a sandwich which I know is 3 plus crisps equals 4 then with my ratio that makes 6 units.. If I classed crisps as 1.5 CP, 4.5 x 1.5 = 6.75 then that makes 7 units. So presumably to those of you who are not as resistant to me as insulin, one unit more or less makes a lot of difference? But t hen as you say you go by your pre meal test and then decide what insulin to take.