My husband tested covid positive on 19th May. On 24th he hospitalized due to lung involvement (ct score 7/20) that time oxygen level was 95%. On 29th May saturation level drops to 88%. Since 29th May to till date heis on oxygen support starting he was on 10l oxygen, now he is on 4l oxygen his oxygen level shows 97-98% in our oximeter, but whey they test oxygen level shows 93-95% to their instrument. Pulmonologist ask to remove mask as much as possible But general doctor said not to remove. He is stable without mask for example if he lying down in proning position is oxygen level is 95-96. In seating position oxygen level is 91-92 without mask. Level drops to 87-89 while eating. We are confused. Is he recovering? Kindly tell your opinion