Oxygen Requirement and Associated Risk Factors in Post-COVID-19 Patients Admitted to a Tertiary Care Center: A Cross-Sectional Study.

Background: COVID-19 commonly affects the lungs and may lead to mild to severe hypoxemia. The supplemental oxygen requirement gradually reduces with the improvement in lung pathology. However, a few patients may have exertional desaturation, and ongoing oxygen needs at the time of hospital discharge.