Covid: 82% of positive rapid tests 'were correct'

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Most positive Covid rapid tests 'were correct'

New data show 26,144,449 lateral flow results were recorded by Public Health England in the four weeks from 8 March to 4 April.

Just over half of those were sent off to a laboratory for a follow-up PCR test, which are far slower to process but can detect much lower levels of virus in the sample, although a positive result doesn't always mean someone is capable of passing the virus on to others. But the other 13,918 - or 82% - returned the same positive result, indicating that the original test was accurate and they did have the virus.

 

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If you had a 20% chance of being struck by lightning every time you went outside would you go?

Almost all the tweets about this have not got the point of it, and that it’s hardly surprising given the way the BBC have reported it. The important conclusion is that (100-99.88) x 0.18 = 0.022 % is the false positive rate. This is actually pretty good.

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