<p><b><span data-ke-size="size23">Covid: How a £20 gadget could save lives</span> </b><br>By James Gallagher <br>Health and science correspondent <br>Published14 hours ago <br><br><br><span data-ke-size="size18"><b>One of the mysteries of Covid-9 is <br>why oxygen levels in the blood can drop to dangerously low levels without the patient noticing.</b></span></p><p> </p><p> </p><p><a href="https://www.bbc.com/news/health-55733527" target="_blank" class="ke-link">Covid: How a £20 gadget could save lives - BBC News</a></p><div class="figure-open" contenteditable="false" data-ke-type="opengraph" data-ke-align="alignCenter" data-og-type="website" data-og-title="Covid: How a £20 gadget could save lives" data-og-description="Doctors say people should buy a pulse oximeter to monitor their oxygen levels at home." data-og-host="www.bbc.com" data-og-source-url="https://www.bbc.com/news/health-55733527" data-og-url="https://www.bbc.com/news/health-55733527" data-og-image="https://scrap.kakaocdn.net/dn/VSXB4/hyI1q1Tfzw/mn3Hpmkg27u99qnvD880KK/img.jpg?width=1024&height=576&face=0_0_1024_576"><a href="https://www.bbc.com/news/health-55733527" target="_blank" data-source-url="https://www.bbc.com/news/health-55733527"><div class="og-image" style="background-image:url(https://scrap.kakaocdn.net/dn/VSXB4/hyI1q1Tfzw/mn3Hpmkg27u99qnvD880KK/img.jpg?width=1024&height=576&face=0_0_1024_576)"></div><div class="og-text"><p class="og-title">Covid: How a £20 gadget could save lives</p><p class="og-desc">Doctors say people should buy a pulse oximeter to monitor their oxygen levels at home.</p><p class="og-host">www.bbc.com</p></div></a></div><p> </p>
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