I am not a physician but the mom of a type one diabetic on a pump. My daughter occasisionally gets blood in the tubing when she removes her site. I have asked my doctor and our pump representative, they have told us that if her numbers are ok it is nothing to worry about.
I would suggest that if it continues to happen to call Minimed and see if the 24 hour help line can give you some suggestions, or call your pump rep
Is it happening when you are connected or disconnected? If your son is disconnected for a while he might need to re prime. Call minimed they will be able to give you guidance.
I am not a doctor but this is just a guess, I also use the minimed pump and have for the past 4 years. I use the sure-t sets and have only once had blood back up into the tubing. If your daughter is 8 years old she probably doesnt get a very large basal rate per hour. I would guess that there is not enough insulin passing through the tube for her (being so young) and that is why the blood backs up into it. There is just not enough coming out of the tube to keep the blood from going into it. I would just call your doctor and ask her.
Hope you figure it out!
Katie, 15