Working out how long Levemir is lasting

Hello all. Im not new to type 1 (diagnosed 10 yrs ago) but have recently been motivated to get myself under better control. Of course the more reading I do the more questions I have and in the last couple of days the more I have scared myself about it all (particularly after reading the Bernstein book that arrived today). So here's my first question.

I take 13 units levemir before bed. This used to be 15 but would often wake up low, so reduced to 14 then 13. I went to bed after not eating for 5 hours with a bgl of 7.8. I woke at 7.5. I repeated this for a few days and always woke at roughly the same reading as I went to bed with. From what I understand this means my basal is correct. But, is it correct just for overnight? How can I tell for how long the levemir remains active? I have read other people's posts that it lasts anywhere from 6 to 22 hours. I note that many people also split their dose, but I'm a little confused about how to decide if that is a good idea or not.

I'm bound to become an active poster now that I've discovered this invaluable forum. Thanks in advance.


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Thanks Brett. So in theory, during the tests if bgl rises, then the basal has stopped working? No doubt many other factors to consider as well. I did notice this morning after waking at 7.8, omelette with cheese and ham for breakfast and 2 units novorapid despite no carbs, 2 hours later I was 9.9.

You'd think after 10 years I'd have this sorted. Getting rather fed up with it all but persistence can only be beneficial.


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