A pulse oximeter estimates blood oxygen saturation (SpO₂) and pulse rate using light. It is useful for monitoring, but the FDA emphasizes that readings have limitations and should be interpreted with symptoms and clinical context.
What matters more than extra features
- Clear intended use and manufacturer instructions
- Readable display and stable signal indication
- Fit for the intended user
- Evidence or regulatory status appropriate to the intended use
- Warranty, service and battery availability
Accuracy is not absolute
The FDA notes that poor circulation, skin pigmentation, skin thickness, skin temperature, tobacco use and fingernail polish can affect readings. Movement and low perfusion can also make measurements less reliable. Do not change oxygen or medication based only on a home pulse-oximeter number.
Medical-purpose vs wellness devices
The FDA distinguishes devices intended for medical purposes from general-wellness products. Buyers using readings for clinical decisions should understand the intended use and evidence behind the specific device.
Browse Respmart's pulse oximeters. Related: how to use a pulse oximeter and low oxygen saturation at home.
Sources
Medical note: This guide is for education and product understanding. It does not diagnose, prescribe oxygen or PAP therapy, select pressure/mode/flow settings, or replace advice from your treating clinician. Follow your prescription and the exact device manufacturer's instructions.
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