Home sleep study said moderate sleep apnea w/severe oxygen saturation <70 & in-clinic study said no sleep apnea & perfect oxygen levels. Which right?

My reaction. Advise you to sit down with your doctor and go over both studies in full detail, as one of these is clearly WRONG. Although I would favor a clinic outcome due to presence of skilled personnel, I cannot clarify the outcomes from this perspective. Good luck with this.
Sleep MD. Make sure you are being evaluated by a board certified sleep MD. Discuss findings and get recommendations.