How Long For Positive Lateral Flow To Show. You can test positive for up to 3 months afterwards and arent required to do LFTs in England. Even though LFTs are less sensitive than PCR the Cochrane Review found that they were most accurate when used during the first week after symptoms developed when 78 of confirmed cases recorded a positive LFT result.
In England if you do the PCR test within 2 days of a positive rapid lateral flow test at a test site and your PCR test is negative you can stop self-isolating. The reason you have to wait the full 30 minutes is because it can show positive falsely before it changes to negative at the 30 minute mark. In the UK over the last few weeks there have been a growing number of reports of people testing positive for Covid-19 on a lateral flow test LFT but then negative on a polymerase chain reaction PCR test.
You can test positive for up to 3 months afterwards and arent required to do LFTs in England.
But while your test may show a negative result a mere hours later it could be positive said Billy Quilty an infectious disease epidemiologist at London School of Hygiene and Tropical Medicine. You can test positive for up to 3 months afterwards and arent required to do LFTs in England. In the UK over the last few weeks there have been a growing number of reports of people testing positive for Covid-19 on a lateral flow test LFT but then negative on a polymerase chain reaction PCR test. That your DS is positive but has such low levels of virus that it is below the limit of detection of the assay but the longer incubation gave a positive result.
