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Flowflex Antigen Rapid Test Lateral Flow Self

Flowflex Antigen Rapid Test Lateral Flow Self

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  • ✔️ Detects SARS-CoV-2 antigen with 99.9% reported specificity
  • ✔️ Delivers a clear COVID-19 result in just 15 minutes
  • ✔️ Suitable for both symptomatic and asymptomatic self-testing
  • ✔️ No prescription required — simple nasal swab technique
  • ✔️ Single-use design ensures hygienic, reliable testing every time

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What Is a Lateral Flow Test and How Does the Flowflex Antigen Rapid Test Work?

 

When you need a quick answer about whether you might have COVID-19, waiting days for a laboratory result simply isn't practical. The lateral flow test format was designed precisely for this — giving you a reliable result at home in around 15 minutes. The Flowflex Antigen Rapid Test Lateral Flow Self is a single-use, over-the-counter test that detects the presence of SARS-CoV-2 nucleocapsid protein directly from a nasal swab sample. It requires no specialist equipment, no laboratory, and no prescription. At just £6.99, it's an accessible option for individuals who want to test themselves quickly and conveniently.

COVID-19 continues to circulate in the UK, and the NHS recommends testing if you have symptoms or have been in close contact with a confirmed case. Whether you're testing before visiting a vulnerable relative or simply want peace of mind, having a reliable test at home makes a real difference. You might also want to explore our cold and flu range if you're managing respiratory symptoms alongside your testing needs.

 

How Does the Flowflex Antigen Rapid Test Detect COVID-19?

 

The Flowflex test uses a technology called colloidal gold immunochromatography. In plain terms, it works by identifying a specific protein on the surface of the SARS-CoV-2 virus. Here's how the process unfolds:

  • You collect a nasal swab sample from both nostrils.
  • The swab is placed into an extraction buffer solution, which releases any viral proteins present.
  • Four drops of this solution are applied to the test cassette.
  • The liquid travels along a nitrocellulose membrane, passing over antibodies that bind specifically to the SARS-CoV-2 nucleocapsid antigen.
  • If the antigen is present, a visible coloured line appears in the T (test) region within 15 minutes.
  • A line always appears in the C (control) region to confirm the test has worked correctly.

It's worth noting that antigen tests are most accurate during the infectious period — typically within the first five days of symptom onset, when viral load is highest.

 

Who Should Use the Flowflex Antigen Rapid Test?

 

This test is suitable for a wide range of people. It's particularly useful if you develop symptoms associated with COVID-19 and want a rapid result without visiting a clinic. It's also helpful for those who need to confirm their status before attending a healthcare setting or visiting someone who is immunocompromised.

  • Adults and children experiencing COVID-19 symptoms such as a new continuous cough, fever, or loss of taste or smell.
  • Individuals who have been in close contact with a confirmed COVID-19 case.
  • People who need to test before visiting vulnerable or elderly relatives.
  • Anyone seeking reassurance before attending a social or work event.

 

How Does the Flowflex Test Compare to Other Rapid Antigen Tests?

 

Feature Flowflex Antigen Rapid Test Standard PCR Test
Result time 15 minutes 24–72 hours
Location At home Laboratory
Prescription required No No (but lab referral needed)
Detects active infection Yes (antigen-based) Yes (RNA-based, higher sensitivity)

 

How Should You Store the Flowflex Antigen Rapid Test?

 

Proper storage is essential to ensure your lateral flow test performs accurately when you need it. Store the Flowflex kit below 30°C in a cool, dry location away from direct sunlight and moisture. Do not freeze the test components, as this can damage the antibody-coated membrane and produce unreliable results. Always check the expiry date printed on the outer packaging before use — an expired test may give a false negative result.

If you're building a home health kit, you might also consider browsing our first aid collection for other essential items to keep on hand.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Flowflex Antigen Rapid Test Lateral Flow Self specifications
Treatment category Diagnostic / COVID-19 testing
Mechanism of action Colloidal gold immunochromatographic detection of SARS-CoV-2 nucleocapsid antigen
Effective Results within 15 minutes
Suitable for Adults and children (adult supervision required for young children)
Active ingredient Colloidal gold-labelled anti-SARS-CoV-2 antibody
Pack sizes 1 test per pack
UK classification General Sale / CE-marked medical device
Preparation Nasal swab with extraction buffer
Route of administration Nasal swab (self-collected)

Specifications of Flowflex Antigen Rapid Test Lateral Flow Self

 

What Is the Flowflex Antigen Rapid Test and What Is It Used For?

 

The Flowflex Antigen Rapid Test Lateral Flow Self is a CE-marked, single-use in vitro diagnostic medical device intended for the qualitative detection of SARS-CoV-2 nucleocapsid protein antigen from nasal swab samples. In everyday terms, it tells you whether the COVID-19 virus is currently active in your body. It is designed for self-testing at home by adults and children (with adult assistance for younger children) and does not require a prescription or laboratory equipment.

The NHS has used lateral flow tests extensively throughout the COVID-19 pandemic as a rapid, accessible screening tool. This test is not intended to replace clinical assessment or PCR testing where those are indicated, but it provides a practical first step when you need a quick answer.

 

What Do You Need to Know Before Using the Flowflex Antigen Rapid Test?

 

Before you open the kit, there are a few important things to be aware of. This test is for in vitro diagnostic use only — meaning it is used outside the body on a collected sample, not administered internally.

Do not use this test if:

  • The packaging is damaged or the seal has been broken.
  • The test has passed its expiry date.
  • The test has been stored outside the recommended temperature range (2°C–30°C).
  • You have had nasal surgery recently — consult your GP before performing a nasal swab.

Important warnings:

  • A negative result does not completely rule out COVID-19 infection, particularly if tested very early in the illness.
  • This test should not be used as the sole basis for clinical treatment decisions.
  • If symptoms persist or worsen despite a negative result, seek medical advice.
  • The extraction buffer contains sodium azide — avoid contact with skin and eyes, and dispose of safely.
  • All used test components should be treated as potentially infectious and disposed of in household waste (not recycling).

Drug interactions:

  • No known drug interactions — this is a diagnostic device, not a medicine.
  • Certain nasal sprays or decongestants used immediately before swabbing may theoretically affect sample quality; blow your nose gently and wait 30 minutes after using nasal products before testing.

 

How Should You Use the Flowflex Antigen Rapid Test?

 

Read the full instructions included in the pack before you begin. Wash your hands thoroughly with soap and water for at least 20 seconds before handling any test components. Lay all components out on a clean, flat surface.

  1. Open the foil pouch and remove the test cassette. Place it on a flat surface.
  2. Open the extraction tube and stand it upright in the tube holder provided.
  3. Remove the swab from its wrapper without touching the soft tip.
  4. Insert the swab approximately 2.5 cm into one nostril. Rotate it firmly against the nasal wall five times.
  5. Using the same swab, repeat in the other nostril.
  6. Insert the swab into the extraction tube and rotate it at least five times while pressing against the tube walls.
  7. Squeeze the tube as you remove the swab, then attach the dropper tip to the tube.
  8. Hold the tube vertically and add exactly four drops to the specimen well (S) on the test cassette.
  9. Read the result at exactly 15 minutes. Do not read after 20 minutes.
Indication Age Group Swab Depth Frequency
Symptomatic COVID-19 testing Adults and children 2.5 cm into each nostril As needed; repeat after 24–48 hrs if negative and symptoms persist
Asymptomatic screening Adults and children 2.5 cm into each nostril As directed by public health guidance

 

What Are the Possible Side Effects of the Flowflex Antigen Rapid Test?

 

As a diagnostic device rather than a medicine, the Flowflex test does not cause systemic side effects. However, the physical process of nasal swabbing can occasionally cause minor discomfort.

Common side effects:

  • Mild nasal discomfort or tickling sensation during swabbing.
  • Temporary watering of the eyes due to nasal stimulation.
  • Sneezing during or immediately after swabbing.

Less common side effects:

  • Minor nosebleed, particularly in individuals with sensitive nasal passages — apply gentle pressure and avoid blowing the nose forcefully.
  • Anxiety or distress related to receiving a positive result — if you feel overwhelmed, contact NHS 111 or your GP for support and guidance.

If you experience significant nasal bleeding that does not stop within 10–15 minutes, seek medical attention. You can also find additional health support products in our electrical health and diagnostic collection.

 

How Should You Store the Flowflex Antigen Rapid Test?

 

  • Store at 2°C–30°C in a cool, dry place.
  • Keep away from direct sunlight and sources of heat.
  • Do not freeze — freezing will damage the test membrane and antibody components.
  • Keep out of reach of children.
  • Do not use after the expiry date printed on the outer carton.
  • Once opened, use the test immediately — do not store a partially used kit.
  • Dispose of all used components as potentially infectious clinical waste in your household bin (not recycling).

If you're managing ongoing health monitoring at home, our vitamins and supplements range may also support your general wellbeing during recovery.

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy the Flowflex lateral flow test online in the UK?

You can buy the Flowflex Antigen Rapid Test lateral flow self-test directly from Cured Pharmacy online for just £6.99. No prescription is needed, and it can be ordered quickly and discreetly to your home address. It's one of the most accessible ways to test for COVID-19 from the comfort of your own home.

How does the Flowflex antigen rapid test work in the body?

The Flowflex test doesn't work inside the body — it works on a nasal swab sample collected from your nostrils. It uses colloidal gold immunochromatography to detect the SARS-CoV-2 nucleocapsid protein, which is present when the virus is actively replicating. A visible coloured line appears in the result window within 15 minutes if the antigen is detected.

How do I use the Flowflex lateral flow test step by step?

Wash your hands, then insert the swab 2.5 cm into each nostril, rotating five times per nostril. Place the swab into the extraction tube, mix thoroughly, then apply four drops to the test cassette specimen well. Read your result at exactly 15 minutes — one line in the C region means negative, lines in both C and T regions mean positive.

How accurate is the Flowflex COVID rapid test?

The Flowflex test has a reported clinical sensitivity of approximately 93% and a specificity of 99.9% when used correctly and within the first five days of symptom onset. Accuracy can be lower if the test is used very early in infection before viral load has built up. For the most reliable result, test when symptoms are present rather than immediately after exposure.

Can children use the Flowflex antigen rapid test?

Yes, the Flowflex test can be used in children, though an adult should assist with the nasal swab for younger or less cooperative children. The swab depth and technique remain the same as for adults. Always read the full instructions in the pack before testing a child.

What does a faint line on the Flowflex test mean?

Any visible line in the T (test) region — no matter how faint — is considered a positive result. The intensity of the line does not indicate how infectious you are or how severe your illness will be. You should follow current NHS guidance on managing a positive COVID-19 result and consider informing close contacts.

What should I do if my Flowflex test result is positive?

If your result is positive, follow the latest NHS guidance on self-isolation and protecting others, particularly those who are vulnerable or immunocompromised. Inform close contacts so they can consider testing themselves. Seek medical advice promptly if you are in a high-risk group, your symptoms are severe, or you are concerned about your health.

What does it mean if no lines appear on the Flowflex test?

If no line appears in the C (control) region, the test is invalid and the result cannot be relied upon. This can happen if the test was stored incorrectly, has expired, or if the steps were not followed accurately. Discard the test and repeat with a new kit, following the instructions carefully.

Who is eligible to use the Flowflex antigen rapid test?

The Flowflex test is suitable for adults and children who wish to test for COVID-19 at home. It is particularly useful for symptomatic individuals, those who have been in close contact with a confirmed case, or anyone who needs to confirm their status before visiting a vulnerable person. No prescription or clinical referral is required. You can also browse our travel range if you need health products for trips abroad.

How long does it take to get a result from the Flowflex lateral flow test?

Results are available in just 15 minutes from the point of applying the sample to the test cassette. You should not read the result before 15 minutes or after 20 minutes, as this can lead to inaccurate interpretation. Set a timer to ensure you read the result in the correct window.

What are the alternatives to the Flowflex lateral flow test?

Alternatives include PCR (polymerase chain reaction) tests, which are more sensitive but require laboratory processing and take 24–72 hours for results. Other branded lateral flow antigen tests are also available, though the Flowflex test is widely recognised for its high specificity. For ongoing health monitoring, our electrical health and diagnostic collection includes additional home testing options.

How should I store the Flowflex antigen rapid test?

Store the Flowflex test between 2°C and 30°C in a cool, dry place away from direct sunlight and moisture. Never freeze the kit, as this damages the antibody-coated membrane and will produce unreliable results. Always check the expiry date on the outer packaging before use.

Can I use the Flowflex test if I have no symptoms?

Yes, the Flowflex test can be used for asymptomatic screening, for example before visiting a vulnerable relative or attending a healthcare setting. However, antigen tests are generally most sensitive during the symptomatic phase when viral load is highest. A negative result in an asymptomatic person does not completely exclude infection.

What are the latest studies on lateral flow antigen tests for COVID-19?

Published data from the UK Health Security Agency (UKHSA) and peer-reviewed studies have consistently shown that lateral flow antigen tests perform well for detecting COVID-19 during the infectious period, with high specificity reducing the risk of false positives. Sensitivity is highest in the first five days of symptom onset when viral load is at its peak. Ongoing surveillance data continues to support their use as a practical community testing tool.

How long can I keep using lateral flow tests at home?

You can use lateral flow tests as often as needed, provided each test is within its expiry date and has been stored correctly. There is no clinical limit on how frequently you test, though current NHS guidance should be followed regarding when testing is recommended. Each Flowflex test is single-use only — never reuse a test cassette or swab.

How Should You Use the Flowflex Antigen Rapid Test?

Using the Flowflex test correctly is essential for getting an accurate result. Before you begin, wash your hands thoroughly with soap and water for at least 20 seconds, and lay all components out on a clean, flat surface in good light.

What Is the Correct Dose of the Flowflex Antigen Rapid Test?

This is a single-use diagnostic device, not a medicine, so there is no "dose" in the traditional sense. Each test kit contains one test cassette, one swab, one extraction tube, and one dropper tip — all of which are used once per test. The table below summarises usage by indication and age group.

When Is the Best Time to Use the Flowflex Antigen Rapid Test?

The Flowflex test is most accurate when used during the symptomatic phase of COVID-19 infection — typically within the first five days of symptom onset, when viral load is at its highest. Testing too early after exposure, before the virus has replicated sufficiently, can result in a false negative. If you have been in close contact with a confirmed case, consider waiting 24–48 hours after exposure before testing, and repeat the test if symptoms develop.

Avoid eating, drinking, or using nasal sprays for at least 30 minutes before testing, as these may affect sample quality. Testing in the morning before eating is often recommended for the most reliable result.

How Long Can You Use the Flowflex Antigen Rapid Test For?

Each Flowflex test is single-use only and must be discarded after one test, regardless of the result. There is no clinical limit on how many times you can test over a period of time — you may test as often as needed, provided each kit is within its expiry date and has been stored correctly between 2°C and 30°C. If you test negative but symptoms persist or worsen after 48 hours, repeat the test or seek medical advice from your GP or NHS 111.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

What Are the Most Common Side Effects of the Flowflex Antigen Rapid Test?

Because the Flowflex test is a diagnostic device rather than a medicine, it does not cause systemic side effects. The most commonly reported issues relate to the physical process of nasal swabbing rather than any chemical or pharmacological action.

  • Mild nasal discomfort or tickling sensation during swab insertion.
  • Temporary watering of the eyes triggered by nasal stimulation.
  • Sneezing during or immediately after swabbing.
  • Brief sensation of pressure inside the nostril.

What Are the Less Common Side Effects of the Flowflex Antigen Rapid Test?

Less commonly, some individuals may experience minor complications from the nasal swab procedure. These are generally mild and resolve quickly without treatment.

  • Minor nosebleed, particularly in people with sensitive or dry nasal passages — apply gentle pressure to the nose for a few minutes and avoid blowing forcefully.
  • Mild nasal soreness if testing is repeated frequently over a short period.
  • Anxiety or emotional distress related to receiving a positive result — this is a normal response and support is available via NHS 111.

What Are the Serious Side Effects of the Flowflex Antigen Rapid Test?

Serious side effects from a nasal swab lateral flow test are extremely rare. However, if you experience a nosebleed that does not stop within 10–15 minutes of applying gentle pressure, seek medical attention promptly. If you accidentally ingest the extraction buffer solution (which contains sodium azide), contact NHS 111 or your local emergency department immediately. Skin or eye contact with the buffer should be rinsed thoroughly with clean water.

What Should You Do If You Experience Side Effects?

For minor nasal discomfort or sneezing, no treatment is required — these sensations pass quickly. If you experience a nosebleed, sit upright, lean slightly forward, and pinch the soft part of your nose for 10–15 minutes. Do not tilt your head back. If bleeding is heavy or prolonged, seek medical advice. For emotional distress following a positive result, the NHS provides clear guidance on next steps and support resources.

Can the Flowflex Antigen Rapid Test Interact With Other Medicines?

As a diagnostic device, the Flowflex test has no known pharmacological interactions with medicines. However, certain nasal products — such as decongestant sprays, saline rinses, or corticosteroid nasal sprays — used immediately before swabbing may theoretically dilute or alter the nasal sample. It is advisable to wait at least 30 minutes after using any nasal product before performing the test to ensure sample integrity. If you are unsure, speak to your pharmacist for personalised advice.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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