 This is a single centre study Churchill Hospital, Oxford recruiting 125 participants over an eight month period. The study will test the reliability of a thoracic ultrasound protocol at identifying lung abnormalities in a stable outpatient population with respiratory disease chronic obstructive pulmonary disease; interstitial lung disease; patients on haemodialysis to replicate acute pulmonary oedema heart failure. It is hoped the results of this study will inform further research in acutely unwell patients with respiratory failure and breathlessness to see whether thoracic ultrasound can improve diagnostic and therapeutic decisions. 