Hi, I recently became diagnosed with asthma. I'm on a preventer treatment and have ventolin/salamol as a reliever when necessary. Stress seems to be my main trigger. I did a peak flow reading at the doctor's recently, and my reading was 500. Is this normal for an asthmatic, as I'm not familiar with peak flow readings? The doctor didn't seem too worried, but said he'd like to see an improvement over the next few weeks or so. If it helps, I'm a 17 year old male, and I'm small and light for my age.