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Positive antigen test & negative Pcr result.

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  • 10-12-2021 9:40pm
    #1
    Lisha
    Registered Users Posts: 8,693 ✭✭✭


    If someone had a positive antigen test but a negative pcr result would you trust the negative result or ever would you think?

    I think I’d look for another pcr, wouldn’t be comfortable interacting with people, as I’d doubt the negative result.

    what would you think?



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    #2
    Micky 32
    Registered Users Posts: 6,556 ✭✭✭Micky 32


    I had a negative PCR on a Thursday. I took 2 antigen tests on the following Monday both had a faint second line that apparently means positive. The following day i took another Antigen ( different brand) it was negative. Took another one the following morning and it was also negative. Took a PCR the following day and it was negative. I had no symptoms whatsoever. Quite strange.

    So they were either false positives or i was exposed to the virus ( breathed it in at some stage) and because i have had the 3 shots the virus didn’t last too long in my system.

    Post edited by Micky 32 on


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    #3
    Lisha
    Registered Users Posts: 8,693 ✭✭✭Lisha


    Your theory is interesting. Makes sense…. In as much as anything Covid makes sense. I’m glad you weren’t sick.



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    #4
    hunter2000
    Registered Users Posts: 142 ✭✭hunter2000


    If your dosed and no symptoms drive on what’s the problem.



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    #5
    Lisha
    Registered Users Posts: 8,693 ✭✭✭Lisha


    https://www.boards.ie/discussion/comment/118303796#Comment_118303796

    Wouldn’t like to think it could be passed on to others. They mightn’t be fully vaxxed and May get sick.



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    #6
    dobman88
    Registered Users Posts: 6,461 ✭✭✭dobman88


    https://www.boards.ie/discussion/comment/118303348#Comment_118303348

    Why are you taking antigens and going for PCRs with "no symptoms whatsoever". Unless I'm missing something obvious, that seems quite strange to me. Not that you tested negative when you weren't sick.



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    #7
    hunter2000
    Registered Users Posts: 142 ✭✭hunter2000


    https://www.boards.ie/discussion/comment/118303853#Comment_118303853

    That’s their risk not yours.



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    #8
    Gael23
    Registered Users Posts: 12,086 ✭✭✭✭Gael23


    The PCR is definitive diagnosis



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    #9
    Micky 32
    Registered Users Posts: 6,556 ✭✭✭Micky 32


    https://www.boards.ie/discussion/comment/118303864#Comment_118303864

    I had some antigen tests, someone had them spare and gave them to me. I was curious to see how they work and i tried one. . Not to mention my line of work is high risk of catching it. My first PCR was because i was travelling.

    I had zero symptoms.



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    #10
    greenblue22
    Registered Users Posts: 6 ✭greenblue22


    This has happened twice in our house. My son had been exposed to covid & didn’t look well/had a headache. Did an antigen it was positive. Waited two days for pcr, at this stage he was feeling better he got a negative. Repeated pcr on advice of nurse who said it was extremely rare. It was also negative. He had a pcr a week prior & that was negative so it wasn’t the case he was at the tail end.

    I had sinus symptoms took an antigen it was positive, took another an hour later (different brand) & it was negative. Took a few more & a pcr all negative.



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    #11
    Big Bag of Chips
    Administrators Posts: 13,769 Admin ✭✭✭✭✭Big Bag of Chips


    Positive antigen +negative PCR seems to be quite common. I personally know 3 people who it happened to. I’d trust the PCR over the antigen.



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    #12
    Martina1991
    Registered Users Posts: 2,540 ✭✭✭Martina1991


    PCR is far more reliable than antigen tests.

    Antigen tests can produce a lot of false negative results, due to an insufficient viral load or performing the test incorrectly.

    They are also prone to interferences. Acidity can cause false positives e.g. coffee, soft drinks, citrus fruits. Anyone who has had to have an antigen test for travel lately may have been asked if you've eaten, drank, smoked or used chewing gum in the 30 mins prior to your test.

    Antigen tests have a lot of limitations that people don't realise. You should not use a a positive result to assume you have the virus, and a negative result doesn't rule it out either.



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