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A normal reading is between 95% and 100% and anything below that is hypoxemia, which can be fatal.

“Right now, we are attempting to change pulse oximeter readings, which are known to cause false reports in dark-skinned individuals, often missing key hypoxemia that would impact medical management.”

A patient must be found to have severe hypoxemia or an arterial oxygen saturation level below 93 percent, both of which would suggest the individual was severely starved of oxygen.

Dr. Ian Wong, a Duke University researcher, confirmed elevated levels of hidden hypoxemia in Black and Hispanic patients.

One University of Michigan study found that the devices that squeeze the finger gave elevated readings in Black people when a blood test showed a lower rate, suggesting “hidden” hypoxemia, or significantly low blood oxygen.