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A device designed to spot early signs of dangerous falls in oxygen levels in Covid patients works less well in those with darker skin, experts are warning.
NHS England and medicines regulator, the MHRA, say pulse oximeters may sometimes overestimate oxygen levels.
The devices beam light through the blood, and skin pigmentation may affect how light is absorbed, they say.
Anyone with concerns is advised to look for changes over time rather than relying on a single reading.
NHS England is issuing updated guidance, advising patients from black, Asian and other ethnic minority groups to continue using pulse