What's a pulse oximeter? Should I buy one to monitor COVID at home?

By Stuart Marshall, Associate Professor, Department of Critical Care, The University of Melbourne
David A. Story, Professor and Head of Department of Critical Care, The University of Melbourne

Having a low level of oxygen in the blood is an early sign of worsening COVID. But not everyone gets obvious symptoms. For instance, some people can have low oxygen levels without getting short of breath or feeling otherwise unwell.

So some people are buying their own device – a pulse oximeter – to monitor their oxygen levels at home. Other people are routinely supplied pulse oximeters as part of their COVID home-care…

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