From the context of your message, I think I correctly understood you to mean you have had no problems with the insulin that is in the insulin pump's infusion se

From the context of your message, I think I correctly understood you to mean you have had no problems with the insulin that is in the insulin pump's infusion set reservoir? Trying to help and I don't want to come off as rude, so please forgive me in advance. The term "insulin on board" has a very specific meaning and it refers to the fast acting insulin that is currently in one's body and still active. So let us say you are using fast-acting insulin, like Humalog, and it stays active in your body for 2.5 hours. You take 3 units of insulin at Noon 1 hour later you take another 3 units of insulin 1 hour later you take another 4 units of insulin At 2:00 you have 10 units of insulin on board At 2:30 you have 7 units of insulin on board At 4:30 you no longer have any insulin on board