I am being treated as if I have asthma since I developed a cough at the end of July 2018. I have had 2 lots of steroids and I'm now on fostair inhaler that has stabilised things. I have a peak flow meter and am taking a reading 2x a day. When I started taking readings I was at 240, my lowest was 90 (when I needed nebulising) and I have now plateaued at 300. I understand that average peak flow for someone my age and height is 450. I'm feeling ok and not struggling with breathing but i'm worried that PF is still so low. I have no real baseline to know what my best is as I never took PF reading before I became unwell. Am I right to be concerned?