Pulse oximeters clip onto a fingertip and pass red and infrared light through the skin to gauge oxygen levels in the blood. It has been known since the 1970s that skin pigmentation can throw off readings, but the discrepancies were not believed to affect patient care.
For the study published in JAMA Internal Medicine, pulse oximetry readings were checked against direct measurement of blood oxygen levels, which is not practical in the average patient because it requires a painful invasive procedure. Pulse oximetry can also be affected by obesity, medications used in critically ill patients, and other factors, Celi said.
Source: Healthcare Press (healthcarepress.net)
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