Respiratory Diagnostics Patient Feedback Please select which service you attended; this is usually found on your appointment letter. Lung Function Testing Breathing Tests Sleep Diagnostics Service Cardiopulmonary Exercise Testing Outpatients at LHCH Sleep Diagnostics Overnight Service Feedback Feedback Cardiopulmonary Exercise Testing (CPET) Liverpool Asthma COPD Service CPAP User Patient Feedback Pre-Visit (CPET) Activity Screening Knowsley Community Respiratory Service