Folks with asthma, COPD, cystic fibrosis, and other pulmonary problems may be able to improve their lifestyles and the effectiveness of prescribed therapies by keeping an eye on their blood oxygen saturation. Portable pulse oximeteters that provide continuous oxygen saturation readings are available from a variety of manufacturers, including one that works with an iPhone, but they all rely on a sensor that clips onto a fingertip or ear lobe. That’s because blood in those spots is close to the surface and the sensor can shine two wavelenghts of light through the tissue and measure how it’s attenuated.
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