My significant other is 28 years old, and has been diagnosised with IPF in late May of this year. He is currently using between 8-10L of oxygen 24/7. Recently, this past week he has been coughing much more frequently than usual, and I have been needing to use both our in home concentrator and our liquid O2 at the same time, meaning he is using about 20L when his oxygen levels begin to drop. With that said, this past week his oxygen levels have been dropping into the low 40s upper 30s, and it is taking more oxygen and time to recover. Has anyone had a similar experience, and when is the appropriate time to seek emergency medical help. He really does not want to go back in to the hospital? Any help or advice would help, thanks.