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Flowflex Antigen Rapid Covid Lateral Flow Test

Flowflex Antigen Rapid Covid Lateral Flow Test

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  • ✔️ Detects SARS-CoV-2 antigen with ~93% clinical sensitivity
  • ✔️ Results ready in just 15 minutes at home
  • ✔️ CE-marked for reliable, regulated self-testing
  • ✔️ Suitable for adults and children without a prescription
  • ✔️ Single nasal swab — no laboratory or clinic visit needed

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What Is a Covid Lateral Flow Test and How Does It Help You?

 

Knowing whether you have COVID-19 quickly can make a real difference — to your own health decisions and to the people around you. The covid lateral flow test from Flowflex is a single-use, CE-marked rapid antigen test that detects the SARS-CoV-2 virus from a simple nasal swab. Results are ready in as little as 15 minutes, with no laboratory equipment needed. At just £3.99, it offers an accessible way to check your status at home, at work, or before visiting vulnerable family members. If you're also managing other health conditions alongside respiratory illness, you might find our cold and flu range useful for symptom relief alongside testing.

The Flowflex test is manufactured by ACON Biotech and has been widely used across the UK and internationally. It is suitable for self-testing in adults and children and does not require a prescription. The NHS previously distributed lateral flow tests free of charge during the pandemic, and while free testing has ended for most people, the tests themselves remain a clinically recognised tool for rapid COVID-19 detection.

 

How Does the Flowflex Antigen Rapid Test Work?

 

The Flowflex test uses immunochromatographic technology — a method that detects specific proteins (antigens) produced by the SARS-CoV-2 virus. Here's how the process works step by step:

  • A nasal swab collects a sample from both nostrils.
  • The swab is placed into an extraction buffer solution, which releases viral antigens from the sample.
  • Three drops of the solution are applied to the test cassette's sample well.
  • The liquid migrates along a nitrocellulose membrane, encountering antibodies labelled with coloured particles.
  • If SARS-CoV-2 nucleocapsid antigen is present, it binds to these antibodies and produces a visible coloured line at the test (T) position.
  • A control (C) line always appears if the test has worked correctly, regardless of the result.

The entire process takes around 15 minutes. You should not read the result after 20 minutes, as this can lead to inaccurate interpretation.

 

Who Should Use the Flowflex Covid Lateral Flow Test?

 

This test is suitable for a wide range of people. Whether you've developed symptoms, been in close contact with a confirmed case, or simply want reassurance before attending an event, rapid antigen testing can help inform your next steps. It is particularly useful for:

  • Adults and children experiencing COVID-19 symptoms such as a new continuous cough, fever, or loss of taste or smell.
  • People who have been in close contact with a confirmed COVID-19 case.
  • Individuals who need to confirm their status before visiting elderly or immunocompromised relatives.
  • Those returning from travel who want to check their status quickly.

It is not intended as a replacement for PCR testing in clinical or high-stakes settings. If you test positive, follow current NHS guidance on next steps.

 

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

 

Feature Flowflex Antigen Rapid Test Standard Lateral Flow Alternative
Result time 15 minutes 15–30 minutes
Sample type Nasal swab Nasal or throat swab (varies)
Reported sensitivity ~93% in symptomatic individuals Varies by brand (70–95%)
CE marked Yes Varies

 

How Should You Store and Handle the Flowflex Covid Lateral Flow Test?

 

Proper storage is essential to ensure your covid lateral flow test gives you a reliable result. Keep the test in its sealed foil pouch until you are ready to use it. Store it below 30°C in a cool, dry location — away from direct sunlight, humidity, and heat sources. Do not freeze the kit. Always check the expiry date printed on the outer packaging before use; an expired test may not perform accurately. If you're managing multiple health monitoring needs at home, our electrical health and diagnostic collection includes a range of home monitoring tools to support your wellbeing.

Once you have opened the foil pouch, use the test immediately. Do not use a test that appears damaged or if the packaging has been compromised. Dispose of used tests safely in your household waste — they are classified as non-hazardous waste for domestic use.

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 Covid Lateral Flow Test specifications
Treatment category Diagnostic / COVID-19 testing
Mechanism of action Immunochromatographic antigen detection of SARS-CoV-2 nucleocapsid protein
Effective Results in 15 minutes
Suitable for Adults and children (adult supervision required for young children)
Active ingredient N/A — diagnostic device (no active pharmaceutical ingredient)
Pack sizes 1 test per pack
UK classification CE-marked in vitro diagnostic medical device
Preparation Lateral flow cassette with nasal swab and extraction buffer
Route of administration Nasal swab (self-administered)

Specifications of Flowflex Antigen Rapid Covid Lateral Flow Test

 

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

 

The Flowflex Antigen Rapid Covid Lateral Flow Test is an in vitro diagnostic (IVD) medical device used to detect the presence of SARS-CoV-2 antigen in nasal swab samples. It is designed for rapid, point-of-care use — meaning you can perform it yourself at home without sending a sample to a laboratory. The test is used to help determine whether you are currently infected with the virus that causes COVID-19, particularly during the symptomatic phase of illness when viral load is typically highest.

It is not a treatment and does not prevent infection. Its purpose is purely diagnostic — to give you timely information so you can make informed decisions about self-isolation, seeking medical care, or protecting others around you. The NHS recognises lateral flow testing as a useful tool for rapid COVID-19 detection in community settings.

 

What Do You Need to Know Before Using the Flowflex Lateral Flow Test?

 

Before you open the kit, there are a few important things to be aware of. This test is a diagnostic device, not a medicine, so there are no drug interactions in the traditional sense. However, certain factors can affect the accuracy of your result.

Do not use this test if:

  • The foil pouch is damaged, torn, or has been previously opened.
  • The test has passed its expiry date.
  • The test has been stored outside the recommended temperature range (below 30°C).
  • You have recently used nasal sprays, decongestants, or saline rinses — wait at least 30 minutes before swabbing.
  • You have eaten, drunk, or smoked within 30 minutes of testing (particularly relevant if using a combined nasal/throat swab method).

Factors that may affect accuracy:

  • Testing very early in infection (before viral load is detectable).
  • Incorrect swabbing technique.
  • Reading the result outside the 15–20 minute window.
  • Presence of certain nasal conditions that may interfere with sample collection.

 

How Should You Use the Flowflex Covid Lateral Flow Test?

 

Follow these steps carefully to ensure an accurate result. Incorrect technique is one of the most common reasons for a false negative. Wash your hands thoroughly before you begin.

  1. Open the foil pouch and remove the test cassette, swab, and extraction tube.
  2. Peel the label from the extraction tube and stand it upright in the tube holder provided.
  3. Insert the swab into one nostril approximately 2–2.5 cm and rotate it firmly against the nasal wall 5 times. Repeat in the other nostril using the same swab.
  4. Place the swab into the extraction buffer in the tube and rotate it at least 10 times, pressing the tip against the tube walls.
  5. Remove the swab while squeezing the tube sides to extract as much liquid as possible. Discard the swab safely.
  6. Attach the nozzle cap to the tube.
  7. Hold the test cassette flat and apply exactly 3 drops of the extracted solution to the sample well (marked "S").
  8. Wait 15 minutes, then read the result. Do not read after 20 minutes.
Indication Age Group Dose / Usage Frequency
COVID-19 symptom check Adults and children 1 test (single nasal swab) As needed; repeat after 24–48 hours if negative but symptomatic
Close contact screening Adults and children 1 test per person As directed by NHS guidance

 

What Are the Possible Side Effects of the Flowflex Lateral Flow Test?

 

As a diagnostic device rather than a medicine, the Flowflex test does not cause systemic side effects. However, there are a small number of physical and interpretive considerations to be aware of.

Common considerations:

  • Mild nasal discomfort or sneezing during swabbing — this is normal and temporary.
  • Minor irritation inside the nostril, particularly in people with sensitive nasal passages.

Less common considerations:

  • False negative result — the test may not detect infection if viral load is very low (e.g. very early or very late in infection).
  • False positive result — rare but possible; a positive result in a person with no symptoms or known exposure should be interpreted cautiously.
  • Nosebleed — very rarely, vigorous swabbing may cause minor bleeding in individuals with fragile nasal mucosa.

If you are unsure how to interpret your result, contact NHS 111 or speak to your pharmacist. You can also find general health support through our first aid range if you experience any minor physical discomfort during testing.

 

How Should You Store the Flowflex Antigen Rapid Test?

 

  • Store at 2°C to 30°C — do not freeze.
  • Keep in the original sealed foil pouch until ready to use.
  • Store away from direct sunlight, moisture, and heat sources.
  • Keep out of reach of children.
  • Check the expiry date before use — do not use an expired test.
  • Once opened, use immediately — do not store an opened test for later use.
  • Dispose of used tests in your normal household waste. They are classified as non-hazardous for domestic disposal.

If you are travelling and need to test on the go, keep the test in its sealed pouch inside a cool bag or away from direct heat. For broader travel health needs, our travel health collection has everything you might need before you head away.

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 covid lateral flow test online in the UK?

You can buy the Flowflex Antigen Rapid Covid Lateral Flow Test directly from Cured Pharmacy online for £3.99 per test. No prescription is needed, and it can be ordered quickly and discreetly to your home address. It is a CE-marked in vitro diagnostic device suitable for self-testing in adults and children.

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

The Flowflex test uses immunochromatographic technology to detect the SARS-CoV-2 nucleocapsid antigen from a nasal swab sample. The sample is mixed with an extraction buffer and applied to a test cassette, where labelled antibodies bind to any viral antigen present and produce a visible coloured line. A control line always appears to confirm the test has functioned correctly.

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

Wash your hands, then swab both nostrils with the provided swab, rotating it firmly 5 times in each nostril. Place the swab into the extraction buffer tube, rotate 10 times, then squeeze the tube as you remove the swab. Apply 3 drops to the test cassette sample well and read the result at exactly 15 minutes — never after 20 minutes.

How accurate is the Flowflex antigen rapid test?

The Flowflex test has a reported clinical sensitivity of approximately 93% and a specificity of 99.9% when used correctly in symptomatic individuals during the peak infectious period. Accuracy can be lower in asymptomatic individuals or when testing very early or very late in the course of infection. Always follow the instructions precisely to maximise accuracy.

What does a positive Flowflex lateral flow test result mean?

A positive result — shown by two coloured lines, one at C and one at T — means SARS-CoV-2 antigen was detected in your sample, indicating you are likely currently infectious. You should follow current NHS guidance, which may include informing close contacts and avoiding contact with vulnerable individuals. Even a faint T line counts as a positive result.

What does a negative Flowflex lateral flow test result mean?

A negative result — one line at C only — means SARS-CoV-2 antigen was not detected at the time of testing. However, a negative result does not completely rule out infection, particularly if you tested very early in the illness or used incorrect technique. If your symptoms persist or worsen, seek advice from NHS 111 or your GP and consider repeat testing after 24–48 hours.

Can children use the Flowflex covid lateral flow test?

Yes, the Flowflex test is suitable for use in children, though an adult should assist with swabbing for younger children to ensure the technique is correct. The swab should be inserted approximately 2–2.5 cm into each nostril, which may feel uncomfortable for young children. Always read the full instructions included in the pack before testing a child.

What should I do if I get a negative result but still feel unwell?

A negative lateral flow result does not completely exclude COVID-19, especially if you tested in the very early stages of infection when viral load may be below the detection threshold. If your symptoms continue or worsen, contact NHS 111 or your GP for further advice. You may also wish to repeat the test after 24–48 hours, as recommended by NHS guidance.

Who is eligible to use the Flowflex antigen rapid test?

The Flowflex test is suitable for adults and children who wish to check for COVID-19 infection, including those with symptoms, close contacts of confirmed cases, or those seeking reassurance before visiting vulnerable individuals. It is available over the counter without a prescription. People with certain nasal conditions should take care when swabbing and may wish to seek advice from a pharmacist first.

What are the alternatives to the Flowflex lateral flow test?

Alternatives to lateral flow testing include PCR (polymerase chain reaction) tests, which are more sensitive but require laboratory processing and take longer to return results. Other branded lateral flow tests are also available, though sensitivity and specificity vary between products. For broader health monitoring at home, our electrical health and diagnostic collection includes a range of home testing and monitoring devices.

How should I store the Flowflex covid lateral flow test?

Store the test in its original sealed foil pouch at between 2°C and 30°C, away from direct sunlight, moisture, and heat. Do not freeze the kit, as this can damage the reagents and affect accuracy. Always check the expiry date on the outer packaging before use and discard any test that has expired or whose packaging appears damaged.

Can I use the Flowflex test if I have a cold or hay fever?

Yes, you can use the Flowflex test if you have a cold or hay fever, as these conditions do not interfere with the test's ability to detect SARS-CoV-2 antigen. However, if you have used a nasal spray or decongestant, wait at least 30 minutes before swabbing to avoid any potential interference with sample collection. If you need support managing hay fever symptoms alongside testing, our allergy and hay fever range may help.

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

Results are available in 15 minutes from the moment you apply the extracted sample to the test cassette. You should not read the result before 15 minutes, as the reaction may not be complete. Equally, do not read the result after 20 minutes, as evaporation lines can appear and be mistaken for a positive result.

Is the Flowflex antigen test approved for use in the UK?

Yes, the Flowflex Antigen Rapid Covid Lateral Flow Test is CE-marked and has been evaluated as part of the UK government's COVID-19 testing programme. It meets the requirements for in vitro diagnostic medical devices and is approved for self-testing use in the UK. The MHRA oversees the regulation of diagnostic devices of this type in Great Britain.

What are the latest findings on lateral flow test performance for COVID-19?

Published research and UK Health Security Agency (UKHSA) evaluations have consistently shown that lateral flow antigen tests, including the Flowflex, perform best during the symptomatic phase of COVID-19 when viral load is highest. Studies have noted that sensitivity can be lower for newer SARS-CoV-2 variants in some individuals, though specificity remains high. The NHS continues to recommend lateral flow testing as a practical tool for rapid community-level detection.

How Should You Use the Flowflex Antigen Rapid Covid Lateral Flow Test?

Using the Flowflex test correctly is essential for getting a reliable 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.

A line at C only means a negative result. Lines at both C and T — even a faint T line — mean a positive result. No line at C means the test is invalid and should be repeated with a new kit.

What Is the Correct Dose of the Flowflex Covid Lateral Flow Test?

This is a single-use diagnostic device, so each test kit is used once per person per testing occasion. There is no "dose" in the pharmaceutical sense, but the table below outlines usage guidance by indication and age group.

When Is the Best Time to Use the Flowflex Covid Lateral Flow Test?

The test is most accurate when used during the symptomatic phase of COVID-19, typically days 2–5 after symptom onset, when viral load is at its highest. Testing too early — within the first 24 hours of exposure — may produce a false negative because the virus has not yet replicated to detectable levels.

If you are testing for precautionary reasons before visiting someone vulnerable, test on the morning of the visit rather than the night before, to reflect your most current status. Avoid eating, drinking, or using nasal sprays for at least 30 minutes before testing.

How Long Can You Use the Flowflex Covid Lateral Flow Test For?

Each Flowflex test is a single-use device and must not be reused. There is no ongoing course of treatment — you simply test as and when needed, following NHS guidance on when testing is appropriate. The test kits have a shelf life printed on the outer packaging; always check the expiry date before use and do not use an expired test, as reagent degradation may affect accuracy.

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

How Should You Use the Flowflex Antigen Rapid Covid Lateral Flow Test?

Using the Flowflex test correctly is essential for getting a reliable 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.

A line at C only means a negative result. Lines at both C and T — even a faint T line — mean a positive result. No line at C means the test is invalid and should be repeated with a new kit.

What Is the Correct Dose of the Flowflex Covid Lateral Flow Test?

This is a single-use diagnostic device, so each test kit is used once per person per testing occasion. There is no "dose" in the pharmaceutical sense, but the table below outlines usage guidance by indication and age group.

When Is the Best Time to Use the Flowflex Covid Lateral Flow Test?

The test is most accurate when used during the symptomatic phase of COVID-19, typically days 2–5 after symptom onset, when viral load is at its highest. Testing too early — within the first 24 hours of exposure — may produce a false negative because the virus has not yet replicated to detectable levels.

If you are testing for precautionary reasons before visiting someone vulnerable, test on the morning of the visit rather than the night before, to reflect your most current status. Avoid eating, drinking, or using nasal sprays for at least 30 minutes before testing.

How Long Can You Use the Flowflex Covid Lateral Flow Test For?

Each Flowflex test is a single-use device and must not be reused. There is no ongoing course of treatment — you simply test as and when needed, following NHS guidance on when testing is appropriate. The test kits have a shelf life printed on the outer packaging; always check the expiry date before use and do not use an expired test, as reagent degradation may affect accuracy.

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

What Are the Most Common Considerations When Using the Flowflex Lateral Flow Test?

The Flowflex Antigen Rapid Covid Lateral Flow Test is a diagnostic device, not a medicine, so it does not cause systemic side effects in the way that pharmaceutical treatments do. That said, there are a small number of physical sensations and interpretive considerations that you should be aware of before and during use.

  • Mild nasal discomfort or a tickling sensation during swabbing — this is normal and passes quickly.
  • Sneezing during or immediately after swabbing — a common reflex response.
  • Temporary watering of the eyes following nasal swabbing.

What Are the Less Common Considerations With the Flowflex Covid Test?

A small number of people may experience slightly more noticeable reactions, particularly those with sensitive nasal passages or pre-existing nasal conditions. These are uncommon but worth knowing about.

  • Minor nasal irritation or soreness after swabbing, particularly if the swab is inserted too forcefully.
  • Very minor bleeding from the nostril in individuals with fragile nasal mucosa — this is rare and usually self-limiting.
  • Discomfort in children who may find the swabbing process distressing — adult supervision and reassurance are recommended.

What Are the Serious Interpretive Risks of the Flowflex Lateral Flow Test?

The most clinically significant risks associated with lateral flow testing are not physical but interpretive. A false negative result — where the test shows negative despite active infection — can occur if you test too early in the illness, use incorrect technique, or have a very low viral load. Conversely, a false positive — a positive result in the absence of true infection — is rare given the test's high specificity of approximately 99.9%, but it can occur.

If you receive a positive result but have no symptoms and no known exposure, consider repeating the test or seeking confirmatory PCR testing. Never make significant clinical decisions based on a single lateral flow result alone without considering the broader clinical picture.

What Should You Do If You Experience Any Discomfort During Testing?

If you experience significant nasal pain, bleeding that does not stop within a few minutes, or any other unexpected physical reaction during testing, stop immediately and do not continue. Apply gentle pressure to the nostril if there is minor bleeding. If bleeding is persistent or you are concerned, contact NHS 111 or your GP for advice.

For minor nasal soreness after testing, a saline nasal rinse may help soothe the nasal passages. If you are concerned about any side effects, contact your pharmacist or GP immediately.

Can the Flowflex Lateral Flow Test Interact With Other Products?

As a diagnostic device, the Flowflex test does not interact with medicines in the pharmacological sense. However, certain nasal products — including decongestant sprays, saline rinses, and steroid nasal sprays — may affect the quality of the nasal swab sample if used immediately before testing. You should wait at least 30 minutes after using any nasal product before performing the test to ensure the sample is not diluted or contaminated. If you are unsure whether a product you use regularly could affect your result, speak to your pharmacist before testing.

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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