![]() ![]() LFD tests identify the most infectious people. This means that for every 10,000 lateral flow tests carried out, there are likely to be fewer than 3 false positive results. The tests are over 80% effective at finding people with high viral loads who are most infectious and most likely to transmit the virus to others.Īnalysis by NHS Test and Trace shows lateral flow device (LFD) tests to have an estimated specificity of at least 99.97% when used in the community. ![]() Rapid lateral flow tests are most useful at identifying COVID-19 in people without any symptoms. In line with the reduced self-isolation approach announced on 22 December, anyone who tests positive will be able to leave self-isolation 7 days after the date of their initial positive test if they receive two negative LFD results, 24 hours apart, on days 6 and 7. This group should use these priority PCR tests when they have symptoms as it will enable prioritised laboratory handling. They will be receiving a PCR test kit at home by mid-January to use if they develop symptoms or if they get a positive LFD result, as they may be eligible for new treatments if they receive a positive PCR result.
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