They are analyzed in the same way as the Polymerase Chain Reaction (PCR ... Insider anal swabs are not nice way of testing, but it makes sense. "It's the obvious thing to do," Santini said.

You need to use a swab to take a sample from the back of ... days from the original lateral flow test result. If you do not take a PCR test within 24 hours you must self-isolate for 10 days.