Science
Covid: How a £20 gadget could save lives – BBC News
Doctors say people should buy a pulse oximeter to monitor their oxygen levels at home.

By James GallagherHealth and science correspondent
image copyrightGetty Images
One of the mysteries of Covid-19 is why oxygen levels in the blood can drop to dangerously low levels without the patient noticing.
It is known as “silent hypoxia”.
As a result, patients have been arriving in hospital in far worse health than they realised and, in some cases, too late to treat effectively.
But a potentially life-saving solution, in the form of a pulse oximeter, allows patients to monitor their oxygen…
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