Following up on my prior post (based on observation of pulse ox readouts during sleep study) where the consensus seemed to be that oxygen sat of 90 or higher during sleep was fine. I just got preliminary results from my sleep study back and the findings are summarized as follows: Severe OSA RDI=33/hr O2 desats to 91 percent. I guess my question is whether the fact that I only "desat" to 91 undermines the finding of "severity"; in other words, even if I am having numerous episodes does the fact that my oxygen remains within normal range suggest it isn't as big a problem as the RDI otherwise might indicate? Thanks.