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False postive latarel flow tests

Discussion in 'Other Health Conditions and Diabetes' started by jenni52, Jul 21, 2021.

  1. jenni52

    jenni52 · Member

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    Has anyone else has false positive covid laterel flow tests? Mine are always positive but PCRs are negative.

    I can't keep isolating every time I take one as I have to get PCRs through the post and the whole process takes nearly a week. Has this happened to anyone else?
     
  2. urbanracer

    urbanracer Type 1 · Expert
    Retired Moderator

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    I've done it a couple of times and it came out negative. Mrs Urb' works in the care sector and has been doing LFD 3 days a week since the start of 2021 and PCR twice a week since October 2020. Neither Mrs Urb' nor any of her colleagues have ever had a positive result from the LFD tests and they have to show them to the manager when they arrive for work.

    Depending on what one chooses to believe, the LFD test either has a very high acuracy of 99% or it's useless and shouldn't be relied upon. The reality may be somewhere in between ?
     
    • Agree Agree x 1
    #2 urbanracer, Jul 21, 2021 at 10:08 AM
    Last edited: Jul 21, 2021
  3. bulkbiker

    bulkbiker Type 2 · Oracle

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    You've not heard about the kids using orange juice to get a false positive so they can bunk off school?

    "OJ Symptoms" is its name allegedly..

    The testing of the well is yet another source of bewilderment...
     
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  4. jenni52

    jenni52 · Member

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    I was reading about that, and some people saying cola causes positive results, made me wonder if my one can of diet coke a day may have an affect on my saliva.

    Apparently the gold standard is a PCR test so I'm more inclined to believe my negative results from those, but the positive LFTs have me worrying that they're picking up some other undiagnosed illness!?
     
  5. Dark Horse

    Dark Horse · Well-Known Member

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    Are you leaving the full 30 minutes after eating/drinking before taking the sample?
     
  6. jenni52

    jenni52 · Member

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    Yes, doesn't matter how long it's been, an hour or all night, there's still a faint line. Very frustrating!
     
  7. Dark Horse

    Dark Horse · Well-Known Member

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    Is it possible that you might have had Covid in the last 90 days?

    "You should not do the LFD test if you have had a positive Covid-19 PCR in the last 90 days. The LFD may give a false positive result if you have recently had Covid-19." https://www.bartshealth.nhs.uk/lateral-flow
     
  8. jenni52

    jenni52 · Member

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    It's highly unlikely. I don't go anywhere apart from walking the dog, had no symptoms, husband and kids take twice weekly tests for work and school which are all negative and there have been no positive cases at either place for months, plus my PCRs are negative.
     
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