Apple is facing a class action lawsuit in the Southern District of New York.
The lawsuit alleges racial bias in the blood oximeter function on Apple's smartwatches.
The plaintiff, Alex Morales, claims that the watch did not accurately measure blood oxygen levels for individuals with darker skin tones.
Morales stated that he expected the product to not have biases and defects with respect to persons of darker skin tone.
The Blood Oxygen feature was introduced with the Apple Watch Series 6 in 2020 and is able to measure oxygen levels on demand.
The lawsuit also alleges that during the coronavirus pandemic, researchers used patients' records to confirm racial bias in pulse oximetry.
There have reportedly been reports for decades that such devices were significantly less accurate in measuring blood oxygen levels based on skin color.
Apple has not yet issued a comment on the lawsuit.
Apple notes on its website that the Blood Oxygen app is only designed for general fitness and wellness purposes.