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Intel Lab Diagnostics Dubai
Single Biomarker

Influenza Virus A & B Antigen, Throat Swab

Flu A & B Antigen (Throat)

This rapid test detects influenza A and B antigens from a throat swab specimen. It offers quick results to support clinical decision-making during respiratory illness outbreaks.

SWAB24 HOURSNO FASTING
AEDAED170
  • Free home collection
  • Physician-reviewed report

24 Hours

Turnaround

Swab

Sample

About This Test

What the Influenza Virus A & B Antigen, Throat Swab test tells you

Influenza A and B antigen testing on a throat swab looks for proteins that sit on the surface of the influenza virus. A swab is passed over the back of the throat and the tonsil area, and the material collected is exposed to antibodies that bind only to influenza proteins. Nothing is grown and no genetic material is copied, which is why this format is chosen when an answer during the same visit is more useful than the most sensitive method available.

The throat is a compromise sampling site. The nasopharynx, high up behind the nose, usually holds more influenza virus, so a nasal specimen tends to detect infection more reliably. A throat swab is easier to tolerate, which matters for children, for people with nosebleeds or recent nasal surgery, and for anyone who cannot stay still for deeper sampling. Because the test depends on there being enough viral protein on the swab, timing matters a great deal: shedding is at its heaviest in the first days of illness and falls away afterwards, so a specimen taken late can read negative even when influenza was the cause.

A positive result is meaningful and is usually accepted at face value during the influenza season, since the test rarely reacts to anything else. A negative result is weaker evidence and has to be read alongside your symptoms, the time of year and what is circulating locally. Your doctor may treat the illness as influenza regardless, or send a molecular test that copies viral genetic material and so detects far smaller amounts of virus. Knowing whether influenza A or influenza B is present also helps with sensible precautions at home, at work and around vulnerable relatives.

Sample type
Swab
Turnaround
24 Hours
Fasting
Not required
Best for
All ages
Why Get Tested?

Used when influenza is suspected and a throat specimen is preferred, particularly during flu outbreaks or when nasal collection is not feasible.

  • A same-visit answer

    Antigen detection needs no culture step, so the result can inform decisions while the illness is still in its early phase.

  • Separating flu from lookalikes

    Fever, aches and cough have many causes. Identifying influenza narrows the list and reduces guesswork about whether antibiotics are needed.

  • Timing antiviral decisions

    Antiviral medicines work best when started early. A confirmed influenza result helps your doctor decide quickly whether they are appropriate for you.

  • Protecting people around you

    Confirmed influenza is a reason to keep distance from infants, pregnant women, older relatives and anyone with weakened immunity.

When This Test Is Ordered

Reasons your doctor may request the Influenza Virus A & B Antigen, Throat Swab test

Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.

  • Sudden flu-like illness

    • Sudden fever, muscle aches, headache and dry cough during the influenza season.
    • Sore throat with fever where nasal sampling is not tolerated or not possible.

  • Higher-risk groups

    • Respiratory symptoms in someone with asthma, chronic lung disease, heart disease or diabetes.
    • Illness in a person who lives with or cares for an infant, an elderly relative or an immunocompromised patient.

  • Outbreaks & clusters

    • A cluster of similar respiratory illness in a household, school or workplace.
Preparation
The short version
No prep needed.
  • Swab
  • Free home collection
  • No fasting
  • Results in 24 Hours
  1. 1
    Book any time

    No fasting window: pick any slot that suits you, online or on WhatsApp.

  2. 2
    We come to you

    A DHA-licensed nurse collects your sample at home or in the office: free home collection.

  3. 3
    Results in 24 Hours

    A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.

Prep note
Physician reviewed

No fasting is needed.

Try to be swabbed within the first few days of symptoms, when the amount of virus in the throat is at its highest. Avoid mouthwash, gargles, antiseptic throat sprays and medicated lozenges in the hour or so before sampling, and do not eat or drink immediately beforehand, since these can wash away or dilute the material being collected.

Tell the collector if you have recently had a nasal influenza vaccine or have already started an antiviral medicine, as both change how the result should be read.

Understanding Your Results

Detected means influenza protein was found on your throat swab, and the report separates influenza A from influenza B. In the influenza season a positive result is usually taken at face value, since the test rarely reacts to anything else; it does not identify the strain or say anything about antiviral resistance. Not Detected is less conclusive. The throat usually holds less virus than the nasopharynx, and shedding is heaviest in the first days of illness, so a swab taken late (or taken soon after mouthwash, a gargle, a medicated lozenge or a meal) can read negative when influenza is the cause. A recent live nasal influenza vaccine, or an antiviral already started, changes how the result should be read. Your doctor weighs the answer against your symptoms, the time of year and local illness patterns, and may add a molecular test that detects far smaller amounts of virus.

SmartReport

Influenza Virus A & B Antigen, Throat Swab

Detected means influenza protein was found on your throat swab, and the report separates influenza A from influenza B. In the influenza season a positive result is usually taken at face value, since the test rarely reacts to anything else; it does not identify the strain or say anything about antiviral resistance. Not Detected is less conclusive. The throat usually holds less virus than the nasopharynx, and shedding is heaviest in the first days of illness, so a swab taken late (or taken soon after mouthwash, a gargle, a medicated lozenge or a meal) can read negative when influenza is the cause. A recent live nasal influenza vaccine, or an antiviral already started, changes how the result should be read. Your doctor weighs the answer against your symptoms, the time of year and local illness patterns, and may add a molecular test that detects far smaller amounts of virus.

Not Detected

The target was not detected: a negative result.

Detected

The target was detected: a positive result. Please consult your physician.

This test is reported descriptively rather than on a numeric scale: each finding below explains what your report may say.

This information is for general education only and is not medical advice. Reference ranges can vary by laboratory, age, sex, and individual factors. Always consult your physician or doctor to interpret your results.

Reading a High or Low Result

  • What a higher result can point to

    • Active influenza A infection while the virus is still being shed from the throat.
    • Active influenza B infection, which is seen often in children and younger adults.
    • Recent influenza that is settling but is still shedding detectable viral protein.
    • Recent vaccination with a live attenuated influenza vaccine given into the nose, which can leave detectable viral antigen for a short period.
    • Influenza occurring alongside another respiratory infection, so the result is true but is not necessarily the whole story.

These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.

Limitations & Safety

What this test cannot tell you

  • A negative result does not rule out influenza, particularly when the swab is taken very early or several days into the illness.
  • Throat specimens usually recover less virus than nasopharyngeal specimens, so this format detects fewer true infections than a molecular test.
  • The test reports the influenza type but not the strain, and says nothing about whether the virus will respond to antiviral medicines.
  • Other respiratory viruses and bacteria are invisible to this test, so a broader panel is needed when the cause remains unclear.

Risks of the blood draw

  • Mild bruising or brief soreness where the needle went in.
  • Occasional lightheadedness, which settles after a few minutes of rest.
  • Bleeding or infection at the site, which is rare with sterile single-use equipment.
Key Points
  • 1A positive result is strong evidence of influenza infection at the moment of sampling.
  • 2A negative result is not proof that you do not have influenza and is read together with your symptoms.
  • 3Sampling within the first few days of symptoms gives the best chance of detection.
  • 4The result separates influenza A from influenza B but not the specific circulating strain.
  • 5Treatment decisions rest with your doctor, who weighs the result against the whole clinical picture.
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FAQ

Frequently Asked Questions

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Yes. The test needs a certain amount of viral protein on the swab before it will react, and that amount is not always present, especially in the first hours of illness or once shedding has faded. Your doctor may still treat the illness as influenza on clinical grounds, or arrange a molecular test that picks up much smaller quantities of virus.