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Flu, COVID or RSV? One Swab Will Tell You — Today.

Medically reviewed by our MD Laboratory Director (a role required by CLIA; the director's name is on file in the CMS CLIA database, #45D2048957, and can be verified independently) · Editorial policy
Molecular fluorescence imaging — Auspicious Laboratory, Houston
One swab · multiple pathogens · same dayCLIA #45D2048957 · CAP #8722734 · Same-day results · Walk-ins welcome
You cannot tell them apart, and neither can your doctor by looking at you. Fever, cough, sore throat, exhaustion — flu, COVID and RSV overlap almost completely. And the rapid antigen test you bought at the pharmacy is least reliable exactly when you need it most: early in the illness, when viral load is still low, a negative result means very little.

Here is why the timing is not a detail. CDC notes influenza antivirals work best when started within 48 hours of symptom onset. That is the entire window. Lose a day waiting for a mail-in result or a second appointment, and you have lost half of it.

One nasal swab. One multiplex PCR panel — influenza A/B, COVID-19, RSV, adenovirus, rhinovirus/enterovirus, Mycoplasma pneumoniae. Sample by 1:00 PM, results at 4:30 PM, physician 4:30–6:00 PM if you need treatment. STAT in 2 hours.
Fever and cough? Get an answer this afternoon, while antivirals still work.
📱 Text (713) 832-8892 📞 Call (713) 266-0808
3707 Westcenter Dr Suite 100, Houston, TX 77042 · Walk-ins welcome
Influenza virus at the ciliated respiratory epithelium — fluorescence rendering
What you are looking at: the columnar cells at the bottom are respiratory epithelium (blue nuclei); the dense blue-green filaments on top are cilia — the escalator that clears mucus and microbes. The magenta spheres are influenza virions, their orange-red spikes standing in for hemagglutinin and neuraminidase. Look closely and you can see the whole cycle: virus in membrane pits (entry) and virus budding outward (release).
The point: PCR does not look for that shape. It matches the virus's RNA sequence — which is why it finds infections a rapid test walks right past.

* Illustrative fluorescence rendering based on the biology and the assay chemistry — not a photomicrograph of a patient sample, and not an instrument output.

PCR vs. the test in your medicine cabinet

Rapid antigen testMolecular PCR (ours)
DetectsViral protein (antigen)Viral nucleic acid
SensitivityLower — often negative early in illnessHigh
CoverageUsually one or two targetsFlu A/B, COVID, RSV and more — one swab
Accepted for travel/clearanceFrequently notGenerally yes (check your requirement)

A negative rapid antigen test does not rule out infection — especially in the first day or two, and especially in the exact window where flu antivirals still work. If your symptoms are real and the box says negative, that is the moment to get a PCR, not to relax.

What we cannot do — and we will say it plainly

A routine respiratory panel is not an H5N1 confirmatory test. It can flag influenza A, but it generally cannot confirm whether that A is H5, which subtype, or which clade. FDA notes most seasonal flu assays will simply report H5N1 as "influenza A." What a good lab does is catch the abnormal signal — influenza A positive, seasonal H1/H3 unsubtypeable — and hand it immediately to public health for H5-specific RT-PCR. H5N1 and the limits of routine testing →
Go to an ER, not to us, if: you have trouble breathing, chest pain or pressure, blue lips or face, persistent high fever, confusion or severe dehydration — or if an infant is breathing fast or with effort, refusing to feed, or producing no tears.

Also useful for

FAQ

Can one swab test for flu, COVID and RSV?
Yes — a single nasal swab runs a multiplex PCR panel covering influenza A/B, COVID-19, RSV and other respiratory pathogens.
My rapid test was negative but I feel awful.
Rapid antigen tests are less sensitive and often negative early in illness. If symptoms are significant, a PCR is the right next step.
Why does 48 hours matter?
CDC notes influenza antivirals work best when started within 48 hours of symptom onset. A day of diagnostic delay costs you half that window.
How fast are results?
Sample by 1:00 PM, results at 4:30 PM the same day. STAT in 2 hours if collected by 3:00 PM.
Can you test for bird flu (H5N1)?
Not definitively — and we will not claim otherwise. A routine panel can flag influenza A, but H5 confirmation requires a public health laboratory. We can identify the abnormal, unsubtypeable signal and escalate it.
Can I get a note for work or travel?
Yes. We provide same-day PCR results with written documentation. Text us the exact test and format your employer, school or airline requires.
Fever and cough? Get an answer this afternoon, while antivirals still work.
📱 Text (713) 832-8892 📞 Call (713) 266-0808
3707 Westcenter Dr Suite 100, Houston, TX 77042 · Walk-ins welcome

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