The COPD assessment test (CAT) is a commonly used disease-specific Patient-completed questionnaire assessing globally the impact of COPD (cough, sputum, dysnea, chest tighteness) on health status for evaluating functional impairment in patients with COPD. Is it applicable to COVID-19 patient or we should develop a new Patient Oriented Outcome Measure for the assessment of lung function for Pulmonary Rehabilitation of the COVID patients.