Hello everyone, I am 34 years old and have been smoking for cca 15 years. I started having short breath, and need to yawn or sigh sometimes to have a normal breath and I decided to do ecg, ultrasound of the heart and spirometry annually. In June, my spirometry results were good, fvc was 3.8(predicted 3.17) fev1 3.4(predicted 2.74) ratio 89.5%. But now in december fvc was 4.88, fev1 was 4.06 while ratio dropped to 83.2%. Should I be worried and is this the early sign of COPD? Thanks a lot