Invalid result is returned when the quality of the sample was unqualified. Incorrect sampling time, taking too early (1-3 days) after exposure causes false negatives, because the virus has not yet multiplied enough for detection. Taking the sample too late (usually from 17th sick day onwards) also causes a false negative because the body has eliminated the virus.
What is invalid result or false negative of Covid-19 test?
Created by: Nguyễn Quỳnh Trang
Modified on: Thu , 26 Jun , 2022 at 4 : 1
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