Skip to product information
1 of 1

  • Images are for illustration purposes only

Flowflex Antigen Rapid Test Lateral Flow Self

Flowflex Antigen Rapid Test Lateral Flow Self

  • 1. Ozempic®️-equivalent therapy now available for weight management
  • 2. Average weight loss of 17%, with 1 in 3 patients achieving over 20%
  • 3. May help reduce osteoarthritis-related pain
  • 4. Wegovy®️ is not expected to impact the effectiveness of oral contraceptives
  • 5. Supports cardiovascular risk reduction
  • 6. Over 22 million patients treated with semaglutide-based therapies since 2018

  • ✔️ Detects SARS-CoV-2 antigen from a simple nasal swab
  • ✔️ Delivers a clear positive or negative result in 15 minutes
  • ✔️ Suitable for adults and children aged 2 years and over
  • ✔️ No laboratory or specialist equipment required for use
  • ✔️ CE-marked diagnostic device for reliable home COVID-19 detection

Price Checker

Regular price £15.99
Sale price £15.99
Sale Sold out
  • Lowest price guarantee
  • Includes FREE private prescription
View full details

 

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

 

If you've ever needed a quick answer about whether you might have COVID-19, you'll know how important it is to get a reliable result fast. The Flowflex Antigen Rapid Test is a lateral flow test designed for self-use at home, giving you a clear result in as little as 15 minutes. It detects the presence of SARS-CoV-2 antigens — proteins from the virus itself — directly from a nasal swab sample. Available from Cured Pharmacy for just £15.99, it's a straightforward, accessible option for anyone who needs to test quickly and confidently.

Rapid antigen testing plays an important role in identifying COVID-19 infection, particularly when symptoms are present. The NHS has long recommended lateral flow testing as a practical tool for detecting infection in symptomatic individuals. Whether you're testing before visiting a vulnerable relative, returning to work, or simply feeling unwell, having a reliable test at home makes a real difference.

 

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

 

The Flowflex test uses immunochromatographic technology — a method that's been used in medical diagnostics for decades. Here's how it works step by step:

  • A nasal swab is inserted approximately 2.5 cm into each nostril and rotated to collect a sample.
  • The swab is placed into an extraction buffer solution and mixed to release any viral antigens present.
  • Three drops of the solution are applied to the test cassette's sample well.
  • The liquid migrates along a nitrocellulose membrane, where it encounters antibodies specific to SARS-CoV-2.
  • If viral antigen is present, it binds to the labelled antibodies and produces a visible coloured line in the test (T) zone.
  • A control (C) line always appears if the test has worked correctly — if it doesn't appear, the result is invalid.
  • Results are read at exactly 15 minutes — not before, not after.

 

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 that could be COVID-19 and want a rapid answer without waiting for a laboratory result. It's also helpful for routine screening in households where someone is at higher risk of serious illness.

  • Adults and children aged 2 years and over (children under 14 should be assisted by an adult)
  • Individuals experiencing COVID-19 symptoms such as fever, new persistent cough, or loss of taste or smell
  • People who have been in close contact with a confirmed COVID-19 case
  • Those who need to confirm their status before visiting clinically vulnerable individuals

 

How Does the Flowflex Lateral Flow Test Compare to Other Rapid Tests?

 

Feature Flowflex Antigen Rapid Test Standard PCR Test
Result time 15 minutes 24–72 hours
Sample type Nasal swab (self-collected) Throat and nasal swab (often clinician-collected)
Suitable for home use Yes No (laboratory required)
Detects SARS-CoV-2 antigen SARS-CoV-2 RNA (genetic material)

 

How Should You Store the Flowflex Antigen Rapid Test?

 

Proper storage is essential to ensure your test gives accurate results. Keep the kit below 30°C in a cool, dry location away from direct sunlight. Never freeze the test components — freezing can damage the antibody-coated membrane and render the test unreliable. Always check the expiry date printed on the outer packaging before use; an expired test may not perform as expected.

If you're stocking up on health essentials at home, it's worth exploring our Electrical Health and Diagnostic range for other monitoring tools that complement your home health kit. Once opened, the test cassette must be used immediately — do not store a partially opened kit for later use.

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 detection
Mechanism of action Immunochromatographic antigen detection
Effective Results in 15 minutes
Suitable for Adults and children aged 2 years and over
Active ingredient None — diagnostic device
Pack sizes Single test kit
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 single-use, in vitro diagnostic medical device used to detect SARS-CoV-2 antigen in nasal swab samples. It is intended for use by individuals who wish to determine whether they are currently infected with the virus that causes COVID-19. The test is designed for self-administration at home and does not require any specialist equipment or laboratory processing.

According to NHS guidance, rapid lateral flow tests are most reliable when used in people who have symptoms of COVID-19. They can also be used as a precautionary measure before contact with people who are at higher risk of serious illness. If you're managing other health conditions alongside respiratory illness, our Cold and Flu range includes supportive products that may help ease symptoms while you await or interpret your result.

 

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

 

Before using this test, read the full instructions included in the kit carefully. There are some important points to be aware of:

  • Do not use the test if the packaging is damaged or the expiry date has passed.
  • Do not eat, drink, smoke, or chew gum for at least 30 minutes before testing — residues in the mouth or nasal passages may affect accuracy.
  • This test is not intended to diagnose any condition other than SARS-CoV-2 infection.
  • A negative result does not completely exclude COVID-19, particularly if tested very early in the course of infection.
  • Do not use if you have had nasal surgery in the past six weeks without medical advice.
  • This is a single-use device — do not attempt to reuse or re-read results after 20 minutes.

There are no known drug interactions with this diagnostic device, as it contains no active pharmaceutical ingredients. However, some nasal sprays or topical nasal treatments used immediately before testing may theoretically affect sample collection quality.

  • No known drug interactions reported for this diagnostic device.

 

How Should You Use the Flowflex Antigen Rapid Test?

 

Follow these steps carefully to ensure an accurate result. Wash your hands thoroughly with soap and water before beginning.

  1. Open the sealed foil pouch and remove the test cassette. Place it on a clean, flat surface.
  2. Open the extraction tube and fill it with the buffer solution provided (to the marked line).
  3. Remove the swab from its packaging. Do not touch the soft tip.
  4. Insert the swab approximately 2.5 cm into one nostril. Rotate it firmly against the nasal wall five times.
  5. Repeat the swabbing process in the other nostril using the same swab.
  6. Place the swab into the extraction tube and rotate it vigorously for approximately 30 seconds.
  7. Squeeze the tube while removing the swab to extract as much liquid as possible. Discard the swab safely.
  8. Attach the dropper tip to the extraction tube.
  9. Hold the tube vertically and apply exactly 3 drops of the extracted solution to the sample well (S) on the test cassette.
  10. Wait exactly 15 minutes before reading the result. Do not read after 20 minutes.
Indication Age Group Swab Depth Frequency
Symptomatic COVID-19 testing Adults and children ≥2 years ~2.5 cm per nostril As needed; repeat after 24–48 hours if negative and symptoms persist
Precautionary screening Adults and children ≥2 years ~2.5 cm per nostril As directed by current public health guidance

 

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

 

Because this is a diagnostic device rather than a medicine, it 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 irritation during swabbing
  • Sneezing triggered by nasal stimulation
  • Temporary watering of the eyes

Less common side effects:

  • Minor nosebleed, particularly in individuals with sensitive nasal mucosa
  • Anxiety or distress in young children during the swabbing process

False positive or false negative results are also possible, though not a physical side effect. A false negative — where the test shows negative despite active infection — is more likely very early in the course of illness when viral load is still low. If you remain symptomatic after a negative result, seek advice from NHS 111 or your GP.

 

How Should You Store the Flowflex Antigen Rapid Test?

 

  • Store at 2°C to 30°C — do not freeze.
  • Keep in a dry place away from direct sunlight and humidity.
  • Keep out of reach of children.
  • Do not use after the expiry date printed on the outer carton.
  • Once the foil pouch is opened, use the test cassette immediately.
  • Dispose of used test components as clinical waste or in accordance with local authority guidance — do not place in general recycling.

If you're building a home health kit, you might also find our First Aid collection useful for keeping essential supplies close to hand.

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 kit directly from Cured Pharmacy online for £15.99. It is available without a prescription and is dispatched quickly to your home address. No appointment or GP referral is needed to purchase.

How does the Flowflex antigen rapid 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. If antigen is present, it binds to labelled antibodies on the test strip and produces a visible coloured line in the test zone. The control line confirms the test has functioned correctly.

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

Follow these steps for an accurate result:

  1. Wash your hands thoroughly before starting.
  2. Swab each nostril approximately 2.5 cm deep, rotating five times per nostril.
  3. Place the swab in the extraction buffer, mix for 30 seconds, then apply 3 drops to the test cassette.
  4. Read the result at exactly 15 minutes — not before or after.
How accurate is the Flowflex antigen rapid test?

The Flowflex test has demonstrated high sensitivity and specificity in clinical evaluations for detecting SARS-CoV-2 antigen, particularly in symptomatic individuals with higher viral loads. However, no rapid antigen test is 100% accurate — false negatives are more likely very early in infection when viral load is still low. A negative result should always be interpreted alongside your symptoms and current NHS guidance.

Can children use the Flowflex lateral flow self-test?

Yes, the Flowflex self-test is suitable for adults and children aged 2 years and over. Children under 14 years of age should be assisted by a responsible adult when performing the nasal swab. The swab should be inserted gently and only to the recommended depth of approximately 2.5 cm.

What does a positive Flowflex test result mean?

A positive result indicates the likely presence of SARS-CoV-2 antigen and suggests you may have an active COVID-19 infection. You should follow current NHS guidance regarding self-isolation and inform anyone you have been in close contact with. Consider contacting NHS 111 if your symptoms are severe or worsening.

What should I do if my Flowflex test is negative but I still feel unwell?

A negative lateral flow result does not completely rule out COVID-19, especially if you tested very early in the course of illness. If your symptoms persist or worsen after 24–48 hours, repeat the test or contact your GP or NHS 111 for further advice. Other respiratory illnesses can cause similar symptoms and may also need attention.

What does an invalid Flowflex test result mean?

An invalid result occurs when no control line appears in the result window, which means the test has not worked correctly. This can happen if insufficient sample was applied, the test was not performed correctly, or the kit was damaged or expired. Discard the test and repeat with a new kit, following the instructions carefully.

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, as lines may still be developing. Results read after 20 minutes are not considered valid and the test should be discarded.

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

Yes, the Flowflex Antigen Rapid Test is a CE-marked in vitro diagnostic medical device that has been evaluated for use in the UK. It meets the performance standards required for lateral flow antigen tests used in community settings. Always check that the kit you purchase is within its expiry date and the packaging is intact.

How should I store the Flowflex lateral flow test kit?

Store the Flowflex test kit at between 2°C and 30°C in a cool, dry place away from direct sunlight. Never freeze the kit, as this can damage the antibody-coated membrane and affect accuracy. Always check the expiry date on the outer packaging before use.

Can I use the Flowflex test if I have had nasal surgery recently?

If you have had nasal surgery within the past six weeks, you should seek medical advice before performing a nasal swab test. Inserting a swab into a recently operated nasal passage could cause discomfort or injury. Your GP or surgeon can advise on the safest approach to COVID-19 testing in your situation.

What are the alternatives to the Flowflex lateral flow test?

The main alternative to a rapid lateral flow antigen test is a PCR (polymerase chain reaction) test, which detects viral RNA and is generally considered more sensitive, particularly at low viral loads. PCR tests typically require laboratory processing and results take 24–72 hours. For home use, other CE-marked lateral flow antigen tests are also available, though the Flowflex is widely used and well-evaluated. You can also explore our Electrical Health and Diagnostic range for additional monitoring options.

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

Used test components — including the swab, extraction tube, and cassette — should be treated as clinical waste. Place all used items in a sealed plastic bag before disposing of them in your household waste bin. Do not place used test components in recycling bins, and wash your hands thoroughly after handling.

Can I use the Flowflex test to check if I am still infectious after COVID-19?

Some people use lateral flow tests to assess whether they may still be infectious during or after a COVID-19 episode, as a positive result generally indicates the presence of detectable antigen and potentially active viral shedding. However, you should always follow current NHS guidance on when it is safe to end self-isolation, as test results are just one factor to consider. Speak to NHS 111 or your GP if you are unsure about your situation. You may also find useful information in our Vitamins and Supplements range to support recovery.

How Should You Use the Flowflex Antigen Rapid Test?

Using the Flowflex Antigen Rapid 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 ensure you are working on a clean, flat surface in good lighting.

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 kit contains one test cassette and one swab — sufficient for a single test. If you need to retest (for example, after a negative result with ongoing symptoms), you will need a new kit.

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

The test is most accurate when used in the first few days of symptoms, when viral antigen levels in the nasal passages are typically at their highest. Testing too early — before symptoms develop or within the first 24 hours — may result in a false negative because viral load may not yet be detectable. If you have been in close contact with a confirmed case, testing 2–3 days after exposure is generally recommended by NHS guidance.

Avoid eating, drinking, smoking, or using nasal sprays for at least 30 minutes before testing, as these can interfere with sample quality and potentially affect the result.

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

Each Flowflex kit is a single-use device and must not be reused. The test cassette must be used immediately after opening the foil pouch — it cannot be stored once opened. The shelf life of the unopened kit is printed on the outer packaging; do not use the test after this date, as the antibody components may have degraded and results may be unreliable.

There is no restriction on how many times you can test over a period of time, provided you use a new kit for each test. If you are testing regularly, purchasing a value pack may be more cost-effective.

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 systemic side effects. The most commonly reported experiences relate to the physical process of nasal swabbing rather than any chemical or pharmacological action.

  • Mild nasal discomfort or irritation during or after swabbing
  • Sneezing triggered by stimulation of the nasal mucosa
  • Temporary watering of the eyes
  • A 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 slightly more noticeable reactions, particularly those with sensitive nasal passages or pre-existing nasal conditions.

  • Minor nosebleed (epistaxis), especially in individuals with fragile nasal mucosa or those taking anticoagulant medicines
  • Temporary nasal congestion following swabbing
  • Anxiety or distress in young children during the swabbing process
  • Skin irritation around the nostrils if the swab is used roughly

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

Serious adverse effects from a nasal swab lateral flow test are extremely rare. However, if you have had recent nasal surgery, a deviated septum, or a known bleeding disorder, there is a small risk of more significant nasal trauma if the swab is inserted incorrectly or too forcefully. Always follow the instructions carefully and insert the swab gently to the recommended depth of approximately 2.5 cm only.

If you experience a nosebleed that does not stop within 20 minutes, or if you feel severe pain during swabbing, stop immediately and seek medical advice from your GP or NHS 111.

What Should You Do If You Experience Side Effects?

Most side effects from nasal swabbing are mild and resolve within a few minutes without any treatment. If you experience nasal discomfort, gently blowing your nose after testing may help. For a minor nosebleed, sit upright, pinch the soft part of your nose, and lean slightly forward for 10–15 minutes. Do not tilt your head back.

If a child becomes very distressed during testing, stop and try again later or seek advice from a healthcare professional about alternative testing approaches. Never force the swab if the child is resisting, as this increases the risk of nasal injury.

Can the Flowflex Antigen Rapid Test Interact With Other Medicines?

As a diagnostic device containing no active pharmaceutical ingredients, the Flowflex test does not interact with medicines in the traditional pharmacological sense. However, certain nasal preparations used immediately before testing — such as saline sprays, decongestant nasal sprays, or topical corticosteroid nasal sprays — may affect the quality of the nasal sample collected. For best results, avoid using any nasal sprays or drops for at least 30 minutes before performing the test.

If you are taking anticoagulant medicines such as warfarin or apixaban, be particularly gentle when inserting the swab, as your risk of nosebleed may be slightly higher than average.

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

We’re a safe and
regulated UK service

Registered Pharmacy Badge

Lowest Price Guarantee

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

100% discreet packaging

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

Agent

Need help?
Talk to our friendly experts now

How our service works

Service Setup

Service setup

Discreet Packaging

Discreet packaging

Express Delivery

Express delivery