How can GPs help ensure #covid19 #antibody tests are used wisely? 100,000 (or is it 200,000?) tests a day is only useful if we get the right test, for the right patient and the right time. Thread https://abs.twimg.com/emoji/v2/... draggable="false" alt="👇" title="Down pointing backhand index" aria-label="Emoji: Down pointing backhand index">
This could cause harm:
Accuracy of these tests needs further evaluation
Won’t change anything for most patients https://www.bbc.co.uk/news/health-52762939
False">https://www.bbc.co.uk/news/heal... positive results could reduce compliance with social distancing in those who assume they are immune
Wasted NHS resource
Wasted GP time
BUT – this doesn’t mean antibody testing is useless – it’s really important for seroprevalence studies to help us understand how many people have been exposed to covid-19, to help ensure lockdown measures are released at the right time and to plan future healthcare
It could also be helpful for:
-untested patients with prolonged atypical ?covid symptoms
-symptomatic pts who present too late for swabs
-those with -ve swab tests
Might reduce risk of missing other diagnoses where we assume symptoms are covid-related https://www.bmj.com/content/369/bmj.m1881">https://www.bmj.com/content/3...
We need better evidence on accuracy and resources to explain this to patients. Remember that if a test is 98% ‘accurate’ this doesn’t mean result will be correct 98% of the time! Can get surprisingly big problems caused by small errors in testing: https://theconversation.com/coronavirus-surprisingly-big-problems-caused-by-small-errors-in-testing-136700">https://theconversation.com/coronavir...
But don& #39;t be scared of Bayes& #39; theorem - GPs are practised at interpreting tests in the context of signs and symptoms, and dealing with uncertainty is what we do.
Let& #39;s not shy away from being involved in testing - but make sure it is clinically led! We must not be complicit in a government drive to meet meaningless targets through scattergun testing of people with ‘no specific clinical indication’.
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