[bigtunacan]

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

[GiorgioG]

You're right - I'm sorry, I shouldn't have been so careless with my words. What I meant was, we've never had a problem with the insulin in his pump's cartridge/reservoir even in 90+ degree heat for 3+ hours with him running and sweating.