I am a life long chronic bronchitic, had a lobectomy of the left lung at 18, am a non smoker, fairly fit and active (Steps not included), I was just wondering if anyone else's lung function is really inconsistent at the moment, or should I be going to the Doctors. Last Sunday I couldn't manage a reading above 120, the next day it was at 200 and I had a brilliant day. Yesterday the reading was 130, today back up to 190. I take no medication, but seem to be very up and down breathing wise. I never have a reading above 200, but I can't put my finger on anything that I am doing any differently day to day, but my readings and breathlessness is really weird, a bit like me I guess.