Can a sleep pulse oximeter diagnose sleep apnea?

No — only a polysomnography (sleep study) can officially diagnose sleep apnea. However, overnight oximetry data showing repeated desaturation events is strong evidence to bring to your doctor for a sleep study referral.

What SpO2 level during sleep is concerning?

Sustained readings below 90% or frequent drops below 88% during sleep warrant medical attention. Brief dips to 92-94% can be normal during deep sleep but repeated events suggest a breathing disorder.

Best Pulse Oximeters for Sleep 2026