EPISODE · Feb 2, 2026 · 8 MIN
Still Sick After a Negative Test? Understanding PCR, BioFire, and When More Information Matters
from HouseCalls and Health · host Tiffany DNP FNP-C
Rapid flu, COVID, and strep tests are helpful — but they don’t always tell the full story. In this episode of Housecalls and Health, we explain why rapid tests can be falsely negative, how PCR-based testing like BioFire works, and when additional testing can change diagnosis and treatment. We discuss real clinical examples, including the rise of mycoplasma pneumonia, why it’s often missed, and how early diagnosis can significantly shorten illness and recovery time.
What this episode covers
Rapid flu, COVID, and strep tests are helpful — but they don’t always tell the full story. In this episode of Housecalls and Health, we explain why rapid tests can be falsely negative, how PCR-based testing like BioFire works, and when additional testing can change diagnosis and treatment. We discuss real clinical examples, including the rise of mycoplasma pneumonia, why it’s often missed, and how early diagnosis can significantly shorten illness and recovery time.
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Still Sick After a Negative Test? Understanding PCR, BioFire, and When More Information Matters
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