Hi Molly,
Your brother's doctor is the best one to answer this question as he/she will know more about your brother's total health condition, but at 35%, your brother is probably in Stage 3, or severe COPD. Most patients at this stage need to be on supplemental oxygen 24/7.
Hope this helps you understand, but never be afraid to call the doctor's office and ask questions. That's your right!
Best,
Kathi
Important:
We hope you find this general health information helpful. Please note however, that this Q&A is meant to support not replace the professional medical advice you receive from your doctor. No information in the Answers above is intended to diagnose or treat any condition. The views expressed in the Answers above belong to the individuals who posted them and do not necessarily reflect the views of Remedy Health Media. Remedy Health Media does not review or edit content posted by our community members, but reserves the right to remove any material it deems inappropriate.