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Single Biomarker

Strep A Rapid Detection Test, Throat Swab

Strep Throat Antigen

This rapid test detects Group A Streptococcus bacteria from a throat swab, the cause of strep throat. Quick results help decide if antibiotics are needed to prevent complications.

SWAB24 HOURSNO FASTING
AEDAED120
  • Free home collection
  • Physician-reviewed report

24 Hours

Turnaround

Swab

Sample

About This Test

What the Strep A Rapid Detection Test, Throat Swab test tells you

The rapid Group A Streptococcus test looks for a carbohydrate that sits in the cell wall of the bacterium responsible for strep throat. A swab is rubbed firmly across both tonsils and the back wall of the throat, and the material collected is treated so that any streptococcal carbohydrate present is released and captured by antibodies on a test device. No bacteria need to be grown, which is why an answer is available while the consultation is still under way.

Most sore throats are viral and get better on their own. The purpose of this test is to find the minority that are bacterial, because those are the ones where antibiotics genuinely shorten the illness, reduce how long a person is infectious to others, and lower the risk of the uncommon complications that can follow untreated streptococcal infection: rheumatic fever affecting the heart and joints, inflammation of the kidneys, and abscess formation beside the tonsil. Sorting one group from the other spares everyone else an antibiotic they do not need.

The test is specific: when it reacts, streptococcal material really was on the swab, so a positive result is generally acted upon. It is, however, less sensitive than a throat culture, which grows the organism over a day or two and detects smaller numbers of bacteria. A negative rapid test in someone with typical features (fever, painful swallowing, pus on the tonsils, tender neck glands and no cough) is therefore often followed by a culture, particularly in a child, in whom both strep throat and its complications are more common. The quality of the swab matters as much as the device: a timid swab that misses the tonsils can read negative when infection is present.

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

First-line test for sore throat with fever, tonsillar exudates, or swollen lymph nodes, especially in children and young adults.

  • Separates bacterial from viral

    Most sore throats are viral, and this test identifies the smaller group in which an antibiotic genuinely changes the course of the illness.

  • An answer within the visit

    Because nothing has to be cultured, the result is available quickly enough to inform the decision made at that appointment.

  • Reduces unnecessary antibiotics

    A negative result in a mild, cough-predominant sore throat supports treating symptoms rather than prescribing antibiotics.

  • Lowers complication risk

    Identifying and treating streptococcal throat infection reduces the chance of the uncommon heart, joint and kidney problems that can follow it.

When This Test Is Ordered

Reasons your doctor may request the Strep A Rapid Detection Test, 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.

  • Sore throat & tonsil findings

    • Sudden sore throat with fever and painful swallowing, particularly without a cough.
    • Pus or white patches on the tonsils with tender, swollen glands in the neck.
    • Sore throat with headache, abdominal pain or a fine sandpaper-like rash.
  • Age group & close contacts

    • Sore throat in a school-age child or young adult, the age group most affected.
    • Sore throat in a household or classroom contact of someone with confirmed strep throat.
  • Repeated tonsillitis

    • Assessment of repeated episodes of tonsillitis.
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 required.

Avoid mouthwash, gargles, antiseptic throat sprays and medicated lozenges before the swab, and do not eat or drink in the minutes immediately beforehand, since these can remove or dilute the material to be collected. Where possible, be swabbed before any antibiotic is started, because even a single dose can reduce bacteria on the throat surface and produce a falsely reassuring result.

The swab reaches both tonsils and the back of the throat and may make you gag briefly, but it takes only a moment.

Understanding Your Results

A Detected result means streptococcal material really was on the swab, and it is generally acted on. It cannot separate genuine infection from harmless carriage, which is common in children, so a child who carries the bacterium may read Detected while the current sore throat is in fact viral. A Not Detected result is the less conclusive of the two. The rapid method is less sensitive than a throat culture, and a timid swab that misses the tonsils can read negative when infection is present, so a negative result in someone with fever, painful swallowing, pus on the tonsils and no cough is often followed by a culture, particularly in a child. Only Group A Streptococcus is looked for here, so other bacterial causes of a sore throat are not reported. Whether you need an antibiotic is your doctor's decision, made alongside your symptoms, your examination and how long you have been unwell.

SmartReport

Strep A Rapid Detection Test, Throat Swab

A Detected result means streptococcal material really was on the swab, and it is generally acted on. It cannot separate genuine infection from harmless carriage, which is common in children, so a child who carries the bacterium may read Detected while the current sore throat is in fact viral. A Not Detected result is the less conclusive of the two. The rapid method is less sensitive than a throat culture, and a timid swab that misses the tonsils can read negative when infection is present, so a negative result in someone with fever, painful swallowing, pus on the tonsils and no cough is often followed by a culture, particularly in a child. Only Group A Streptococcus is looked for here, so other bacterial causes of a sore throat are not reported. Whether you need an antibiotic is your doctor's decision, made alongside your symptoms, your examination and how long you have been unwell.

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

    • Acute Group A streptococcal pharyngitis or tonsillitis.
    • Scarlet fever, in which the same bacterium produces a characteristic rash alongside the sore throat.
    • Chronic throat carriage of Group A Streptococcus in someone whose current sore throat is actually viral.
    • A recent streptococcal infection where bacterial antigen is still present shortly after treatment began.
    • Streptococcal infection detected in a contact who has only mild symptoms.

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

  • The rapid test is less sensitive than a throat culture, so a negative result in someone with typical symptoms, especially a child, is often confirmed by culture.
  • It cannot distinguish genuine infection from harmless carriage, which is common in children and can make a viral sore throat look bacterial.
  • Only Group A Streptococcus is detected; other bacterial causes of sore throat will not be reported.
  • The result depends heavily on swab technique, since a specimen that misses the tonsils may read negative despite infection.

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 reliable evidence that streptococcal material was present on the swab.
  • 2A negative result is less conclusive and may be followed by a throat culture.
  • 3Some people carry the bacterium without being ill, so results are read with the clinical picture.
  • 4Testing is most useful in sore throat with fever and no cough, and least useful in a typical cold.
  • 5Whether to prescribe an antibiotic is a decision for your doctor, not one the result makes on its own.
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FAQ

Frequently Asked Questions

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Culture grows the bacterium over a day or two and can detect smaller numbers than a rapid antigen device, so it picks up infections the rapid test misses. When symptoms are typical and the rapid test is negative, particularly in a child, a culture is the sensible next step rather than a sign that anything went wrong with the first test.