Low blood oxygen levels are treated with oxygen therapy, which involves delivering oxygen through a face mask, nose tubes, or endotracheal tube, which is inserted into your windpipe (aka trachea).

88-year-old's clinical conditions are 'improving' after more than a month in hospital Pope Francis has suspended the use of an oxygen mask, the Vatican said on Wednesday, adding that the 88-year ...

Pope Francis has stopped the use of oxygen mask to breathe at night and his health ... during blood transfusions to help boost hemoglobin levels and improve oxygen delivery in the blood.