A doctor told us what a faint line REALLY means on your lateral flow test.
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With the advent of LFTs, London-based A&E doctor Nathan explained what it could mean when you end up with a faint red line.
He said, “Essentially, if there is * one * line before the end of the interpretation window (see package insert, normally 30 minutes), then this is a * positive * test and you need to isolate and book a PCR.
“However, if a line appears * after * the interpretation window, it does NOT count as a positive test. You don’t have to isolate or book a PCR. “
A negative result of the lateral flow test
(Image: Martin Keene / PA Wire)
Nathan spoke out when it was confirmed that there were no new curbs coming for New Year’s Eve.
He added, “If the weak positive line shows up after the time window, the most likely cause is either contamination (e.g. just incredibly low levels of the virus.
“If the latter is the case, and assuming, of course, that you are asymptomatic at the time, then it is very unlikely that you are at risk of transmission anyway, and so it is of little concern.”
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