inclusion criteria: outpatients age>18 with pcr positive covid19 at least 4-weeks prior; persistent opacities (ggo and/or reticular changes) on any chest imaging at least 4-weeks after positive covid pcr; hypoxemia as defined by any of the below: or patient already on supplemental oxygen or room air saturation 94% or less

inclusion criteria: outpatients age>18 with pcr positive covid19 at least 4-weeks prior; persistent opacities (ggo and/or reticular changes) on any chest imaging at least 4-weeks after positive covid pcr; hypoxemia as defined by any of the below: or patient already on supplemental oxygen or room air saturation 94% or less

inclusion criteria: 1. outpatients age>18 with pcr positive covid19 at least 4-weeks prior; 2. persistent opacities (ggo and/or reticular changes) on any chest imaging at least 4-weeks after positive covid pcr; 3. hypoxemia as defined by any of the below: 1. or patient already on supplemental oxygen 2. or room air saturation 94% or less

inclusion criteria: 1. outpatients age>18 with pcr positive covid19 at least 4-weeks prior; 2. persistent opacities (ggo and/or reticular changes) on any chest imaging at least 4-weeks after positive covid pcr; 3. hypoxemia as defined by any of the below: 1. or patient already on supplemental oxygen 2. or room air saturation 94% or less

inclusion criteria: 1. outpatients age>18 with pcr positive covid19 at least 10-weeks prior; 2. persistent opacities (ggo and/or reticular changes) on any chest imaging at least 10-weeks after positive covid pcr; 3. hypoxemia as defined by any of the below: 1. desaturation 3% or greater from baseline at rest or with any ambulation at or below target hr ([220-age]*0.6))# 2. or patient already on supplemental oxygen 3. or room air saturation 90% or less

inclusion criteria: 1. outpatients age>18 with pcr positive covid19 at least 10-weeks prior; 2. persistent opacities (ggo and/or reticular changes) on any chest imaging at least 10-weeks after positive covid pcr; 3. hypoxemia as defined by any of the below: 1. desaturation 3% or greater from baseline at rest or with any ambulation at or below target hr ([220-age]*0.6))# 2. or patient already on supplemental oxygen 3. or room air saturation 90% or less