Federal health officials are proposing changes to make sure medical devices that measure oxygen levels are working for patients of color.

A Food and Drug Administration (FDA) draft guidance would require manufacturers of pulse oximeters to gather far more clinical data to show the devices accurately work across a range of skin tones. The long-awaited guidance released Monday comes in response to mounting evidence that the devices,

The agency is calling for the devices to be tested on significantly more people, as well those with darker skin tones, steps experts say are critical to incentivizing manufacturers to fix racial disparities in the accuracy of the devices’ readings.

Years of research have showed that pulse oximeters yield less accurate readings for people with darker skin tones, and now the US Food and Drug Administration is proposing guidance to help make these devices more reliable and less biased.

Responding to complaints that pulse oximeters that measure blood oxygen levels are less accurate in people with darker skin tones, the Food and Drug Administration Monday released long-awaited guidance proposing how manufacturers should test and label these devices.