The doctors monitored 'oxygen' levels in her blood.
breathing pure 'oxygen'
an 'oxygen' tank
(..) You know the best part of working in the clean room? No allergies. Check it out. Oh, that-that... that's a lot of oxygen. We should get going to Amy's. Can you believe there was a time when we would have (..)2014 TvShow: The Big Bang Theory Title: The Clean Room Infiltration Season: 8 Episode 11