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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 accurately within 15 minutes
  • ✔️ Suitable for symptomatic and asymptomatic self-testing at home
  • ✔️ Value bundle pack ideal for households and workplace screening
  • ✔️ Single nasal swab method — no throat swab required
  • ✔️ CE-marked in vitro diagnostic device for reliable home use

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

 

If you need a quick, reliable way to check for COVID-19 at home, the Flowflex Antigen Rapid Test Lateral Flow Self is one of the most widely used options available in the UK. A lateral flow test works by detecting specific proteins — known as antigens — produced by the SARS-CoV-2 virus, giving you a result in as little as 15 minutes without needing a laboratory. This bundle pack is ideal for households, workplaces, or anyone who tests regularly and wants to keep a supply to hand. You can also browse our Electrical Health and Diagnostic collection for other monitoring and testing products.

The NHS has previously recommended rapid antigen testing as a practical tool for identifying infectious individuals, particularly those who may be asymptomatic. While formal national testing programmes have changed since the pandemic, self-testing remains a sensible precaution — especially before visiting vulnerable people or attending crowded settings.

 

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

 

The test uses immunochromatographic technology — a method where labelled antibodies on a nitrocellulose strip bind to viral antigens if they are present in your sample. Here is a simplified breakdown of the process:

  • A nasal swab collects a sample from both nostrils
  • The swab is placed into a buffer solution that extracts the sample
  • Three drops of the solution are applied to the test cassette
  • Antibodies on the test strip react with any SARS-CoV-2 antigen present
  • A visible coloured line appears in the result window within 15 minutes

One line in the control (C) zone means a negative result. Two lines — regardless of how faint the second line appears — indicates a positive result. No line at all means the test is invalid and should be repeated with a new kit.

 

Who Should Use the Flowflex Antigen Rapid Test?

 

This test is suitable for a wide range of people. It is particularly useful if you have symptoms of COVID-19, have been in close contact with a confirmed case, or need to test before visiting someone who is clinically vulnerable. The test is designed for self-use by adults and can be used in children with adult supervision.

  • Adults with COVID-19 symptoms such as fever, new continuous cough, or loss of taste or smell
  • People who have been in close contact with a confirmed COVID-19 case
  • Those visiting elderly or immunocompromised individuals
  • Employers or organisations requiring regular staff screening

It is not intended as a replacement for clinical diagnosis. If you test positive or your symptoms are severe, seek advice from your GP or NHS 111.

 

How Does the Flowflex Test Compare to a PCR Test?

 

Feature Flowflex Lateral Flow Test PCR Test
Result time 15 minutes 24–72 hours
Location At home Laboratory
Detects Viral antigen (protein) Viral RNA (genetic material)
Sensitivity High when viral load is elevated Very high across all stages

 

How Should You Store the Flowflex Lateral Flow Test?

 

Each individually sealed test pouch should be stored below 30°C, away from direct sunlight and moisture. Do not freeze the tests — freezing can damage the antibody-coated strip and produce unreliable results. Always check the expiry date printed on the foil pouch before use; an expired lateral flow test may give a false negative even if you are infectious.

Keep tests in their original packaging until you are ready to use them. If you are building a household supply, storing them in a cool, dry cupboard is perfectly adequate. For other health monitoring essentials, take a look at our First Aid range.

This product is a medical device. 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 self-testing
Mechanism of action Immunochromatographic antigen detection
Effective Results within 15 minutes
Suitable for Adults and children (with adult supervision)
Active ingredient Not applicable — diagnostic device
Pack sizes Value bundle pack
UK classification CE-marked in vitro diagnostic medical device
Preparation Nasal swab with buffer solution
Route of administration Nasal swab (self-administered)

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 an in vitro diagnostic (IVD) medical device used to detect the presence of SARS-CoV-2 antigens in nasal swab samples. It is intended for self-testing by individuals who want to determine whether they are currently infected with the virus that causes COVID-19. The test is not a medicine — it does not treat or prevent infection. Its purpose is purely diagnostic: to help you make informed decisions about self-isolation, visiting others, or seeking further medical advice.

COVID-19 can present with a wide range of symptoms, from mild cold-like signs to more serious respiratory illness. The NHS advises that people with symptoms such as a high temperature, a new continuous cough, or a loss or change to their sense of smell or taste should consider testing. This lateral flow test is a convenient, accessible way to do that at home.

 

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

 

Before you open the test pouch, there are a few important things to be aware of. This test is for nasal use only — it is not designed for throat swabbing or any other route. Do not use it if the foil pouch is damaged or the expiry date has passed.

Do not use this test if:

  • The packaging is torn, punctured, or shows signs of damage
  • The test has been stored outside the recommended temperature range
  • The expiry date printed on the pouch has passed
  • You have had nasal surgery recently — consult your GP first

Important warnings:

  • This test is for in vitro diagnostic use only — do not ingest any component
  • A negative result does not completely rule out infection, particularly early in the course of illness
  • A positive result should prompt you to follow current NHS guidance on self-isolation
  • This test does not replace clinical assessment by a healthcare professional
  • Keep all components out of reach of children

Known interactions:

  • No drug interactions apply — this is a diagnostic device, not a medicine
  • Nasal sprays or decongestants used immediately before testing may theoretically affect sample quality; blow your nose and wait a few minutes before swabbing if possible

 

How Should You Use the Flowflex Antigen Rapid Test?

 

Using the test correctly is essential for an accurate result. Read the full instruction leaflet included in your pack before you begin. Wash your hands thoroughly before and after the procedure.

  1. Remove the test cassette and extraction tube from the sealed pouch
  2. Add the buffer solution to the extraction tube up to the fill line
  3. Insert the swab approximately 2 cm into one nostril and rotate 5 times against the nasal wall
  4. Repeat in the second nostril using the same swab
  5. Insert the swab into the extraction tube and rotate it at least 10 times
  6. Squeeze the tube walls while removing the swab to extract the sample
  7. Attach the nozzle cap to the tube
  8. Apply exactly 3 drops of the solution to the sample well (S) on the test cassette
  9. Wait 15 minutes before reading the result — do not read after 30 minutes
User Age Group Swab Depth Supervision Required
Self-testing adult 18 and over ~2 cm into each nostril No
Child Under 18 ~1–2 cm (as tolerated) Yes — adult must assist

 

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 have pharmacological side effects. However, the physical process of nasal swabbing can occasionally cause minor discomfort. If you experience persistent nosebleeds or significant pain, stop and seek advice from a pharmacist or GP.

Common effects associated with nasal swabbing:

  • Mild nasal discomfort or tickling sensation
  • Sneezing during or after swabbing
  • Watery eyes as a reflex response
  • Temporary mild irritation inside the nostril

Less common effects:

  • Minor nosebleed, particularly in people with sensitive nasal passages
  • Anxiety or distress related to the testing process or result

If you are concerned about any side effects, contact your pharmacist or GP. For general health support, you may also find our Cold and Flu range helpful if you are managing symptoms alongside testing.

 

How Should You Store the Flowflex Antigen Rapid Test?

 

  • Store at 2°C to 30°C — do not freeze
  • Keep in a dry location away from direct sunlight and humidity
  • Store in the original sealed foil pouch until ready to use
  • Check the expiry date on each individual pouch before use
  • Dispose of used test components as clinical waste or in accordance with local authority guidance — do not place used swabs or cassettes in general recycling
  • Keep all components out of reach of children and pets

If you are stocking up for a household or workplace, our Vitamins and Supplements collection is also worth exploring to support general immune health alongside regular testing.

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 order the Flowflex Antigen Rapid Test Lateral Flow Self directly from Cured Pharmacy online at £64.99 for the value bundle pack. It is dispatched promptly and delivered to your door, so you can keep a supply at home without needing to visit a shop. Ordering online is particularly convenient if you test regularly or need multiple tests for a household or workplace.

How does the Flowflex lateral flow test detect COVID-19?

The Flowflex test uses immunochromatographic technology to detect SARS-CoV-2 antigens — proteins produced by the virus — in a nasal swab sample. Antibodies on the test strip bind to any viral antigen present, producing a visible coloured line in the result window. This process happens within 15 minutes and does not require any laboratory equipment.

How do I use the Flowflex antigen rapid test step by step?

Insert the swab approximately 2 cm into each nostril and rotate it 5 times against the nasal wall, then place it into the extraction tube containing buffer solution. Squeeze the tube, attach the nozzle cap, and apply exactly 3 drops to the sample well on the test cassette. Read the result after 15 minutes — two lines (however faint) means positive, one line means negative, and no lines means the test is invalid.

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

Results are available within 15 minutes of applying the sample drops to the test cassette. You should not read the result after 30 minutes, as evaporation lines can appear and may be mistaken for a positive result. Set a timer when you apply the drops to ensure you read the result in the correct window.

What does a positive Flowflex lateral flow test result mean?

A positive result — shown by two coloured lines in the result window — means SARS-CoV-2 antigen has been detected in your sample, indicating you are likely currently infectious. You should follow current NHS guidance, which may include staying at home and avoiding contact with vulnerable people. If you are unsure what to do, contact NHS 111 or your GP for advice.

What does a negative Flowflex test result mean?

A negative result means SARS-CoV-2 antigen was not detected in your sample at the time of testing. However, a negative result does not completely rule out infection — particularly in the very early stages of illness when viral load may be low. If your symptoms persist or worsen, consider retesting after 24 hours or seeking clinical advice.

Can children use the Flowflex antigen rapid test?

Yes, the Flowflex test can be used in children, but an adult should perform or closely supervise the swabbing process, particularly for younger children who may find nasal swabbing uncomfortable. Insert the swab gently and only as far as is comfortable for the child. Always read the full instruction leaflet included in the pack before testing a child.

Is the Flowflex lateral flow test accurate?

The Flowflex test has been evaluated and found to have high sensitivity and specificity for detecting SARS-CoV-2 antigen, particularly when viral load is elevated — which typically corresponds to the most infectious period. Like all lateral flow tests, it is most accurate when used correctly and at the right stage of infection. PCR testing offers higher sensitivity overall, especially at very low viral loads.

Who is eligible to use the Flowflex antigen rapid test?

The test is suitable for adults and children who want to check for COVID-19 infection at home. It is particularly useful for people with symptoms, those who have been in close contact with a confirmed case, or anyone who needs to test before visiting a vulnerable person. People who have recently had nasal surgery should consult their GP before using a nasal swab test.

What are the alternatives to the Flowflex lateral flow test?

Alternatives include other CE-marked antigen rapid tests available from pharmacies and online retailers, as well as PCR testing which offers higher sensitivity but requires laboratory processing and takes longer to return results. For broader health monitoring needs, you can also explore our Electrical Health and Diagnostic collection. The right choice depends on your specific situation and how quickly you need a result.

How should I store the Flowflex lateral flow test?

Store the tests at 2°C to 30°C in a dry place away from direct sunlight — a cool kitchen cupboard or medicine cabinet is ideal. Do not freeze the tests, as this can damage the antibody-coated strip and produce unreliable results. Always check the expiry date on the individual foil pouch before use and do not use a test if the packaging is damaged.

How do I dispose of a used Flowflex lateral flow test?

Used test components — including the swab, extraction tube, and cassette — should be treated as clinical waste. Place them in a sealed bag before disposing of them in your general household waste bin; do not place them in recycling. Wash your hands thoroughly after handling used test components. Follow any specific local authority guidance on disposal of COVID-19 test materials.

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

Yes, the Flowflex lateral flow test can be used even if you have no symptoms — this is sometimes called asymptomatic testing. It can be useful before visiting elderly or immunocompromised individuals, or in workplace screening programmes. Bear in mind that sensitivity may be slightly lower in asymptomatic individuals due to lower viral loads, so a negative result should still be interpreted with caution.

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

An invalid result — shown by no line appearing in the control (C) zone — means the test has not worked correctly and the result cannot be interpreted. This can happen if insufficient sample was applied, the test was not stored correctly, or the kit is expired or damaged. Repeat the test using a new kit from your pack, following the instructions carefully.

How long can I keep using lateral flow tests for COVID-19?

You can use lateral flow tests for as long as you feel it is clinically appropriate — there is no set limit on how long you should continue testing. Many people test when they develop symptoms, after close contact with a case, or before visiting vulnerable individuals. For ongoing health support alongside testing, our Cold and Flu range includes products to help manage symptoms while you recover.

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 out all the components on a clean, flat surface.

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

This is a single-use diagnostic device, not a medicine, so "dosing" refers to how many tests you should perform and how frequently. One test cassette is used per testing episode. If a result is invalid, use a fresh test from your pack.

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

For symptomatic individuals, testing as soon as symptoms develop gives the most clinically useful result, as viral load tends to be highest in the first few days of illness. If you are testing for precautionary reasons — for example, before visiting an elderly relative — test on the morning of the visit for the most relevant result.

Avoid eating, drinking, or using nasal sprays immediately before testing. Blowing your nose gently a few minutes before swabbing can help clear excess mucus and improve sample quality.

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

Each test in this bundle pack is a single-use device with its own individual expiry date printed on the foil pouch. You can continue using tests from the pack until the expiry date is reached, provided each pouch has been stored correctly and remains undamaged. There is no clinical limit on how many times you can test over a period — test as often as your situation requires.

If you are regularly testing due to ongoing exposure risk or a health condition, speak to your GP or pharmacist about whether additional clinical assessment is appropriate alongside home testing.

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 Antigen Rapid Test is a diagnostic device rather than a medicine, it does not cause pharmacological side effects. However, the physical process of nasal swabbing can cause minor, temporary discomfort in some people. These effects are generally mild and resolve within a few minutes of completing the test.

  • Mild stinging or tickling sensation inside the nostril during swabbing
  • Sneezing during or immediately after the swabbing process
  • Watery eyes as a natural reflex response to nasal stimulation
  • Temporary mild irritation or redness at the nostril entrance

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

Less commonly, some individuals may experience slightly more noticeable effects, particularly those with sensitive nasal passages or a history of nosebleeds. These are still generally minor and short-lived.

  • Minor nosebleed, especially in people with fragile nasal blood vessels
  • Temporary nasal congestion or increased mucus production after swabbing
  • Mild headache in sensitive individuals
  • Anxiety or emotional distress related to the testing process or awaiting a result

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

Serious adverse effects from nasal swab testing are extremely rare. However, if you experience a persistent or heavy nosebleed that does not stop within 10–15 minutes of applying gentle pressure, seek medical attention. Do not attempt to insert the swab deeply into the nasal passage — the recommended depth is approximately 2 cm, which is well within the nasal vestibule and should not cause significant trauma in most people.

If you accidentally ingest any component of the test kit — particularly the buffer solution — contact NHS 111 or your local poison control service immediately and have the product packaging to hand.

What Should You Do If You Experience Side Effects?

For mild nasal discomfort or sneezing, no specific action is needed — these effects resolve quickly on their own. If you experience a minor nosebleed, sit upright, pinch the soft part of your nose, and breathe through your mouth for 10–15 minutes. Avoid tilting your head back. If bleeding is heavy or does not stop, seek urgent medical advice.

If you feel significant anxiety about testing or interpreting results, speaking to a pharmacist can be reassuring. They can help you understand what your result means and what steps to take next.

Can the Flowflex Antigen Rapid Test Interact With Other Medicines?

As a diagnostic device, the Flowflex test has no known drug interactions. It does not contain any active pharmaceutical ingredient and is not absorbed into the body. However, using nasal decongestant sprays or saline rinses immediately before swabbing may theoretically dilute the nasal sample. For best results, avoid nasal sprays for at least 30 minutes before testing and blow your nose gently beforehand to clear excess mucus.

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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