![]() ![]() Specificity – this refers to the proportion of true negatives a test correctly identifies. PCR on the other hand, is useful for confirming suspected COVID-19 cases, where the person is already self-isolation and showing symptoms. Lateral flow should be used to find out if a person is infectious now and is able to transmit the virus to others. However, PCR and Lateral flow have two different roles to play in preventing the spread of the virus, so it isn’t helpful to directly compare in terms of sensitivity. When an individual has lower levels of the virus in their system, lateral flow tests are far less sensitive than PCR testing which is mainly used for individuals displaying symptoms. Sensitivity – this refers to the proportion of true positives that a test correctly identifies. In terms of reporting the accuracy levels of lateral flow diagnostic tests, there are two key considerations – sensitivity and specificity. However, the speed and convenience of these tests does come at the expense of accuracy – meaning care has to be taken in both the interpretation and communication of the results. ![]() Inside the device is a strip of test paper that changes color in the presence of COVID-19 antigens. The test-kit is a hand-held device with an absorbent pad at one end and a reading window at the other. Lateral flow testing is an established technology, adapted to detect antigens that are present when an individual has contracted COVID-19. The test itself is both small and portable and can be administered with minimal training – eliminating the intricate transport and laboratory procedures required for PCR testing. The lateral flow tests offer a means of quick testing for SARS-CoV-2 (the virus that causes COVID-19) – typically delivering a result in 15-30 minutes. Unlike PCR testing (involving complex laboratory equipment and highly trained staff), lateral flow tests are processed on the spot and return a result far quicker. Thousands of positive COVID cases have already been detected using the Rapid Antigen tests. The simple and fast nature of the test helps to identify those spreading the infection quickly and encourage immediate self-isolation to prevent any further spread. Opening up Lateral Flow Testing to trace those not displaying symptoms is effectively one of the most important factors in assisting to find positive cases earlier and ultimately break any hidden chains of transmission. Identifying these individuals is saving lives. A complete guide to Lateral Flow testing.Īs stated in the NHS Test and Trace Guidelines, one in three individuals with COVID-19 do not display any symptoms and are therefore spreading the virus unknowingly. ![]()
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