the hosp consultant told him if his blood gas levels do not improve next time he goes to see him then they will have to look for another cause for the hypoxia not the pneumonia. he mentioned among other things leukemia but my husband can't remember what else was mentioned. any ideas? my husband was in hospital two years ago and was told his oxygen sats were low but nothing was done to follow this up. he has not felt completely well since this time. he has been diagnosed with sarcoidosis(levels under control at the moment) and also oesophageal spasms.