Finger pulse oximeter and COVID-19

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A pulse oximeter is a small device that clips onto your finger and monitors oxygen levels in the blood.
They have been getting attention for their potential to help monitor symptoms of COVID-19 at home, but there are some caveats you should know about before rushing out to buy one.
One of the many strange things about COVID-19 is that some patients with very low blood oxygen levels aren’t always aware of it.
They may not feel particularly unwell or have other symptoms of low oxygen levels.                    
This is where pulse oximeters can be helpful as they allow people to track their blood oxygen levels at home, and are an important preventative tool for certain groups.
They are used commonly in clinical settings, and have helped people with Long Covid (enduring post-viral symptoms), or those who are more vulnerable to the disease monitor themselves at home.