Ultra-low-cost clinical pulse oximetry

Annu Int Conf IEEE Eng Med Biol Soc. 2013;2013:2874-7. doi: 10.1109/EMBC.2013.6610140.


An ultra-low-cost pulse oximeter is presented that interfaces a conventional clinical finger sensor with a mobile phone through the headset jack audio interface. All signal processing is performed using the audio subsystem of the phone. In a preliminary volunteer study in a hypoxia chamber, we compared the oxygen saturation obtained with the audio pulse oximeter against a commercially available (and FDA approved) reference pulse oximeter (Nonin Xpod). Good agreement was found between the outputs of the two devices.

MeSH terms

  • Artifacts
  • Calibration
  • Cell Phone
  • Equipment Design
  • Fingers
  • Humans
  • Hypoxia / diagnosis*
  • Motion
  • Oximetry / economics
  • Oximetry / instrumentation*
  • Oxygen / chemistry
  • Perfusion
  • Signal Processing, Computer-Assisted*


  • Oxygen