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People with COPD who need and use continuous oxygen therapy 24 hours a day tend to have a longer lifespan than those who use it only while awake (15 hours per day). In turn, individuals who use oxygen therapy 15 hours per day do better than those who use it only while they are sleeping. Publication Review By: Peter B. Terry, M.D., M.A. Published: 08 Aug 2011
An oxygen level in the range you mention (88% or less) is the usual indication for starting oxygen in patients with COPD. It is perhaps easier to answer the question of what oxygen can do in this situation, rather than what the effects of a low oxygen level are.