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Introduction: The covid 19 pandemic has exploded since cases were rst reported in China on December 2019.As of July 9 2020, more than 12 million cases of Covid 19 caused by Severe Acute Respiratory Syndrome Corona Virus-2(SARS-CoV-2) have been reported, and cases have been reported in more than 180 countries. Aim and Objectives: To study the common abnormality in pulmonary function tests in post Covid 19 discharged patients and to correlate with the severity of the disease. Material and Method: A single centre, hospital based, observational, crosssectional study was conducted in the Department of General Medicine, KPC Medical College and Hospital, Jadavpur, Kolkata, both indoor and OPD patients from 25th of August 2020 to 25th Of June 2021. Result: In our study, 16(20.0%) patients had Mild restriction at PFT Spirometry Finding-x, 34(42.5%) patients had Moderate Restriction at PFT Spirometry Finding-x, 23(28.8%) patients had moderately severe Restriction at PFT Spirometry Finding-x and 7(8.8%) patients had severe restriction at PFT Spirometry Finding-x. Conclusion: DLCO/Va-x was less in severe disease followed by mild and moderate disease which was statistically signicant. DLCO/Va-y was less in severe disease followed by mild and moderate disease which was statistically signicant.