How Long For Positive Lateral Flow To Show. Lateral flow test turning positive after many hours. If you do the PCR test later than this youll need to self-isolate for 10 full days even if you get a negative PCR result.
We do have patients that waited a week and still have a headache and then they do PCR and its positive However the head of the UK Health Security Agency Dr Susan Hopkins assured MPs the lateral flow tests can be relied upon to pick up the mutant variant. Symptoms typically start to appear five days after contracting Covid-19. If you have tested positive for COVID-19 and have received confirmation of this via a PCR test you need to wait 90 days after your PCR test was taken before starting lateral flow home testing again.
And self-isolate until you get that result.
You will see a covid recovery pass in your NHS after about 2 weeks which you can use anywhere that requires a passport. 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. 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. 2 lines one next to C and one next to T even faint lines shows the test is positive.