What can cause a false positive flu test
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Influenza b antigen positive means.
Rapid Influenza Diagnostic Tests
Background
Rapid influenza diagnostic tests (RIDTs) are immunoassays that can identify the presence of influenza A and B viral nucleoprotein antigens in respiratory specimens and display the result in a qualitative way (positive vs.
negative) 1. In the United States, several RIDTs are commercially available.
Flu symptoms, but negative flu test
The reference standards for laboratory confirmation of influenza virus infection in respiratory specimens are reverse transcription-polymerase chain reaction (RT-PCR) or viral culture. RIDTs can yield results in a clinically relevant time frame, i.e., less than approximately 15 minutes.
However, RIDTs have limited sensitivity to detect influenza viruses in respiratory specimens compared to RT-PCR or viral culture and negative RIDT test results should be interpreted with caution given the potential for false negative results, especially during peak influenza activity in a community.
Some RIDTs use analyzer reader devices to standardize result interpretation.
Keep Reading:Information for Clinicians on Rapid Diagnostic Testing for Influenza
- how long is rapid flu test
- how long does it take to get rapid flu test results