when I got started on my Combo pump the 2 pump reps that I have seen have just said to leave the Acting Time at 4hrs, Offset to 1hr and meal rise to 4.
It now appears according to this website http://www.diabetesnet.com/about-diabet ... lin-action
which is posted in a thread by Dragonflye that the acting time with some insulins can be a lot longer than 4hrs.
I think Novorapid has a far longer action than 4hrs due to its slower onset and then longer duration but I've been able to compare this with other bolus insulins - Humalog and Apidra which are a bit faster and shorter duration.
It would have been nice I think for Accu chek to take into account a bit what bolus insulins people were going to use and then set the pump up accordingly instead of just leaving everything to the default.
I'm now going to do a complete basal test again and then sort out carb bolus and correction factors all over again so that I can get the Combo to deliver correctly. Most annoying......
The Combo as Candi and CarbsRok has said wont always tell you how much Active Insulin you have as it will presume that your carb ratio is correct and that your acting time is correct. What can happen for loads of people will be if they eat a snack and bolus for it and then go to eat a meal 2-3hrs later and then bolu for that. The pump wont tell you that it was only 2hrs earlier that you used a bolus and if your bg is higher when you do the next bolus although it will give you a correction, it wont take into account the bolus for the snack..... so insulin stacking can occur. This is why I now realise the reasons for getting the acting time somewhere correct..............especially with the Combo.