I am a 25 year old female. I was at the doctors this morning because I've been feeling really breathless lately. I feel like I can't get a satisfying breath. The doctor got me to do a peak flow test and the result was 350. He said he would have expected it to be higher than that and has given me an inhaler. Can anyone tell me what a normal peak flow reading should be for a girl my age? Should I be worried about this?