Hello, I'm an elementary school nurse and I have a student who has had 3 open heart surgeries for a heart defect, I don't know much else that is all the mom put on her medical history. One day I checked her oxygen level because she looked blue around the mouth and really pale and her oxygen level was in the 80's, her mom came to pick her up for something else nonrelated and I asked her about it and she said that was normal for her and she always runs in the 80's. She never has a problem with SOB and does physical activity without any trouble, so since I'm not a pediatric cardiology expert I was wondering if this is normal for some cardiac patients and why wouldn't they put her on O2?