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UK warns Covid-19 monitor devices work less well for darker skin

Britain’s state-run healthcare service warned on Saturday that devices used by people with Covid-19 to monitor blood-oxygen levels at home may give inaccurate readings for people with darker skin.

The warning concerned pulse oximeters, currently being used by many of those at risk of severe Covid-19 symptoms to check their blood-oxygen levels. Below a certain reading, they need to be hospitalised.

The NHS,