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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 antigens accurately within 15 minutes
  • ✔️ Suitable for symptomatic and asymptomatic adults and children
  • ✔️ High specificity of 99.0% reduces risk of false positives
  • ✔️ Simple nasal swab method requires no specialist training
  • ✔️ Single-use kit contains all components needed for testing

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

 

If you've had a sniffle, a scratchy throat, or just want peace of mind before visiting a vulnerable relative, a lateral flow covid test is one of the quickest ways to check whether you're carrying the SARS-CoV-2 virus. The Flowflex Antigen Rapid Covid Lateral Flow Test gives you a clear result in around 15 minutes — no lab, no waiting room, no fuss. At just £2.99 per test, it's an accessible option for individuals, families, and workplaces alike. The NHS has consistently recommended rapid antigen testing as a practical tool for identifying infectious individuals, particularly those without symptoms.

COVID-19 remains a concern for many people across the UK, especially those who are immunocompromised, elderly, or living with long-term health conditions. Having a test at home means you can act quickly — whether that's isolating, rescheduling plans, or seeking further medical advice. If you're also managing other health conditions and keeping an eye on your general wellbeing, you might find our vitamins and supplements range useful for supporting your immune health alongside regular testing.

 

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

 

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

  • A nasal swab collects a sample from both nostrils.
  • The swab is placed into an extraction buffer solution, which releases any viral antigens present.
  • Three drops of the solution are applied to the test cassette.
  • Labelled antibodies on the test strip bind to SARS-CoV-2 antigens if they are present, producing a visible coloured line.
  • Results appear within 15 minutes — one line means negative, two lines means positive.

The test is most accurate when used within the first five days of symptom onset, when viral load tends to be at its highest. Asymptomatic individuals can also use it, though sensitivity may be slightly lower in those without symptoms.

 

Who Should Use the Flowflex Covid Lateral Flow Test?

 

This test is suitable for a wide range of people. It's particularly useful if you're experiencing symptoms consistent with COVID-19, have been in close contact with a confirmed case, or need to confirm your status before attending a social or medical appointment. It is appropriate for:

  • Adults aged 18 and over who are symptomatic or asymptomatic
  • Children under adult supervision (particularly those under 12)
  • Carers and healthcare workers requiring regular screening
  • Individuals visiting elderly or clinically vulnerable people

It is not intended as a replacement for a PCR test in clinical settings. If you receive a positive result or your symptoms are severe, contact your GP or NHS 111 for further guidance.

 

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

 

Feature Flowflex Antigen Rapid Test Standard PCR Test
Result time ~15 minutes 24–72 hours
Sample type Nasal swab Throat and nasal swab
Sensitivity ~93.3% ~97–99%
Available OTC Yes No (lab-based)

 

How Should You Store and Handle the Flowflex Covid Test?

 

Proper storage is essential to ensure your lateral flow covid test performs accurately. Keep the test in its original sealed packaging, stored below 30°C in a cool, dry location away from direct sunlight. Do not freeze the kit — freezing can damage the reagents and invalidate results. Always check the expiry date printed on the outer box before use; an expired test may not give reliable results.

Each kit contains everything you need: a test cassette, extraction tube, buffer solution, nasal swab, and a result card. No additional equipment is required. If you're building a home health kit, our first aid collection has a range of essentials to keep alongside your tests.

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 COVID-19 diagnostics / rapid antigen testing
Mechanism of action Immunochromatographic antigen detection
Effective Results in approximately 15 minutes
Suitable for Adults and children (children under 12 require adult assistance)
Active ingredient SARS-CoV-2 antigen detection reagents
Pack sizes Single test (1 per pack)
UK classification CE-marked medical device (IVD)
Preparation Lateral flow immunoassay cassette
Route of administration Nasal swab

Specifications of Flowflex Antigen Rapid Covid Lateral Flow Test

 

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

 

The Flowflex Antigen Rapid Covid Lateral Flow Test is an in vitro diagnostic (IVD) medical device designed to detect the presence of SARS-CoV-2 antigens in nasal swab samples. It is used to identify active COVID-19 infection in both symptomatic and asymptomatic individuals. The NHS has used lateral flow tests extensively as part of its COVID-19 testing strategy, recognising their value in rapid, accessible screening. This test is for self-use at home and does not require any specialist training or laboratory equipment.

 

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

 

Before you open the kit, there are a few important things to be aware of. This test detects antigens — not antibodies — so it tells you whether you are currently infected, not whether you have had COVID-19 in the past or whether you are immune.

Do not use this test if:

  • The packaging is damaged or the seal is broken
  • The test has passed its expiry date
  • You have had nasal surgery recently (consult your GP first)
  • You are using it to replace a clinically required PCR test

Important warnings:

  • A negative result does not completely rule out COVID-19 — false negatives can occur, particularly very early in infection
  • A positive result should be treated as presumptive; follow current UK government guidance on self-isolation
  • This test is not intended for use with throat swabs or saliva samples
  • Results should be read at exactly 15 minutes — reading too early or too late may give inaccurate results

Known interactions:

  • No drug interactions are applicable — this is a diagnostic device, not a medicine
  • Eating, drinking, or using nasal sprays immediately before testing may affect accuracy; wait at least 30 minutes

 

How Should You Use the Flowflex Lateral Flow Test?

 

Using the test correctly is key to getting an accurate result. Wash your hands thoroughly before you begin, and lay all components out on a clean, flat surface. Follow these steps carefully:

  1. Open the foil pouch and remove the test cassette. Place it on a flat surface.
  2. Remove the swab from its wrapper — do not touch the soft tip.
  3. Gently insert the swab approximately 2 cm into one nostril and rotate it five times against the nasal wall.
  4. Repeat in the other nostril using the same swab.
  5. Place the swab into the extraction tube containing the buffer solution.
  6. Stir the swab vigorously for approximately 30 seconds, then squeeze the tube sides while removing the swab.
  7. Attach the dropper tip to the tube and apply exactly 3 drops to the sample well (marked "S") on the cassette.
  8. Set a timer for 15 minutes and read the result — do not read after 20 minutes.
Indication Age Group Swab Depth Frequency
Symptomatic testing Adults & children ~2 cm into each nostril Once; repeat if symptoms persist
Asymptomatic screening Adults & children ~2 cm into each nostril As required (e.g. twice weekly)

 

What Are the Possible Side Effects of the Flowflex Covid 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 result-related considerations to be aware of.

Common experiences:

  • Mild discomfort or sneezing during nasal swabbing
  • Temporary watering of the eyes after swabbing
  • Slight nasal irritation, particularly in those with sensitive nasal passages

Less common concerns:

  • False negative result — more likely very early in infection or in asymptomatic individuals
  • False positive result — rare but possible; confirm with a PCR test if unexpected
  • Minor nosebleed if the swab is inserted too forcefully — always use gentle pressure

If you experience persistent nasal bleeding or significant discomfort, stop testing and seek advice from your GP or pharmacist. For general respiratory symptom management, our cold and flu range may help ease associated symptoms while you await results.

 

How Should You Store the Flowflex Covid Lateral Flow 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, heat sources, and humidity
  • Keep out of reach of children
  • Do not use after the expiry date printed on the outer packaging
  • Dispose of used test components as clinical waste or in accordance with local authority guidance — do not place in general recycling

If you're keeping a stock of tests at home alongside other health essentials, our electrical health and diagnostic collection includes a range of monitoring tools to support your home health routine.

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 a lateral flow covid test online in the UK?

You can buy the Flowflex Antigen Rapid Covid Lateral Flow Test directly from Cured Pharmacy online for just £2.99 per test. No prescription is needed, and it can be ordered quickly and discreetly to your home address. It's one of the most affordable options available from a GPhC-registered UK pharmacy.

How does the Flowflex antigen rapid covid test work?

The Flowflex test uses immunochromatographic technology to detect SARS-CoV-2 antigens from a nasal swab sample. If viral antigens are present, they bind to labelled antibodies on the test strip and produce a visible coloured line within 15 minutes. One line indicates a negative result; two lines indicate a positive result.

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

Wash your hands, then insert the swab approximately 2 cm into each nostril and rotate five times. Place the swab into the extraction tube, stir for 30 seconds, then apply 3 drops to the test cassette sample well. Read your result at exactly 15 minutes — not before, and not after 20 minutes.

How accurate is the Flowflex lateral flow covid test?

The Flowflex test has a reported clinical sensitivity of approximately 93.3% and a specificity of 99.0% based on published validation studies. Accuracy is highest when the test is used within the first five days of symptom onset, when viral load is typically at its peak. Asymptomatic testing may yield slightly lower sensitivity.

Can children use the Flowflex antigen rapid test?

Yes, the Flowflex test is suitable for both adults and children. Children under the age of 12 should always 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 cm.

What does a positive Flowflex covid test result mean?

A positive result means SARS-CoV-2 antigens were detected in your nasal sample, indicating you are likely currently infected and potentially infectious to others. You should follow current UK government guidance, which may include self-isolation and informing recent close contacts. If you feel unwell, contact NHS 111 or your GP for further advice.

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

A negative lateral flow result does not completely rule out COVID-19, especially if you test very early in the course of infection. If your symptoms persist or worsen, consider repeating the test after 24 hours or requesting a PCR test through your GP. You can also browse our cold and flu range for products to help manage symptoms in the meantime.

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

Results appear on the test cassette within 15 minutes of applying the sample. You should not read the result before 15 minutes, as the reaction may not be complete. Results read after 20 minutes should be disregarded, as evaporation lines can appear and may be mistaken for a positive result.

Who is eligible to use the Flowflex antigen rapid covid test?

The test is suitable for any adult or child who wishes to check for active COVID-19 infection, whether symptomatic or asymptomatic. It is particularly useful for carers, healthcare workers, and those visiting clinically vulnerable individuals. It is not intended for clinical diagnostic use in a hospital or laboratory setting.

What are the alternatives to a lateral flow covid test?

The main alternative is a PCR (polymerase chain reaction) test, which is more sensitive but requires a laboratory and typically takes 24–72 hours to return a result. PCR tests are generally used to confirm a positive lateral flow result or when a higher degree of accuracy is clinically required. For home use, lateral flow tests remain the most practical and accessible option.

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 person or attending a large gathering. However, sensitivity is slightly lower in asymptomatic individuals compared to those with active symptoms. Regular testing — such as twice weekly — can help improve the reliability of asymptomatic screening.

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, heat, and moisture. 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 expired tests safely.

What happens if I get an invalid result on the Flowflex test?

An invalid result occurs when no control line appears on the test cassette, which may indicate a procedural error or a faulty test. If this happens, repeat the test using a new kit, following the instructions carefully. If you continue to get invalid results, contact your pharmacist for advice.

Are there any side effects from using the Flowflex nasal swab test?

The test is a diagnostic device rather than a medicine, so there are no systemic side effects. Some people experience mild nasal discomfort, sneezing, or temporary eye watering during the swabbing process. Inserting the swab too forcefully can occasionally cause minor nasal irritation or a small nosebleed, so always use gentle pressure. If you're managing other health concerns alongside testing, our pain relief collection may help with any associated discomfort.

What are the latest findings on lateral flow covid test accuracy?

Published studies and MHRA evaluations have consistently shown that lateral flow antigen tests, including the Flowflex, perform well when used correctly during the symptomatic phase of COVID-19 infection. The UK Health Security Agency (UKHSA) has noted that sensitivity is highest in the first five days of symptoms. Ongoing surveillance continues to assess performance against emerging SARS-CoV-2 variants.

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 all components out on a clean, flat surface in good lighting. Avoid eating, drinking, smoking, or using nasal sprays for at least 30 minutes before testing.

What Is the Correct Dose of the Flowflex Covid Test?

This is a single-use diagnostic device, not a medicine, so "dosage" refers to the number of tests used and the frequency of testing. Each kit contains one complete test. The table below outlines recommended use 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 within the first five days of symptom onset, when viral antigen levels in the nasal passages are typically at their highest. If you have been exposed to a confirmed COVID-19 case, it is generally recommended to wait until at least day 5 after exposure before testing, as testing too early may produce a false negative result even if infection is present. Testing in the morning, before eating or drinking, can also help reduce the risk of sample contamination.

How Long Can You Use the Flowflex Covid Test For?

Each Flowflex test is a single-use device and must be discarded after one use, regardless of the result. There is no limit on how many tests you can use over time, provided each test is within its expiry date and stored correctly. If you are using tests for regular asymptomatic screening, twice-weekly testing is a commonly recommended frequency. Always check the expiry date printed on the outer packaging before each use — expired tests should not be used as their accuracy cannot be guaranteed.

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

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What Are the Most Common Experiences When Using the Flowflex Covid Test?

Because the Flowflex Antigen Rapid Covid Lateral Flow Test is a diagnostic device rather than a medicine, it does not cause systemic side effects in the way that a drug might. However, the physical process of nasal swabbing can cause some mild, temporary sensations that are worth knowing about before you begin. Most people find the process straightforward and tolerate it well.

  • Mild discomfort or pressure in the nostril during swabbing
  • Sneezing immediately after inserting the swab
  • Temporary watering of the eyes
  • Brief sensation of nasal irritation that resolves within a few minutes

What Are the Less Common Side Effects of the Flowflex Nasal Swab?

A small number of people may experience slightly more noticeable reactions, particularly those with sensitive nasal passages, a history of nasal polyps, or recent nasal surgery. These are uncommon but worth being aware of.

  • Minor nosebleed caused by inserting the swab too forcefully — always use gentle pressure
  • Prolonged nasal irritation lasting more than 30 minutes after swabbing
  • Mild headache in individuals with sinus sensitivity

What Are the Serious Concerns Associated With the Flowflex Covid Test?

Serious physical reactions to nasal swabbing are extremely rare. The more clinically significant concerns relate to result accuracy rather than physical harm. A false negative result — where the test shows negative despite active infection — can occur, particularly if the test is used very early in the course of illness or if the swabbing technique is incorrect. A false positive result is rare but possible, and any unexpected positive result should ideally be confirmed with a PCR test. Acting on an inaccurate result without further confirmation could have implications for your health decisions and those around you.

What Should You Do If You Experience Side Effects From the Flowflex Test?

If you experience a minor nosebleed after swabbing, apply gentle pressure to the soft part of your nose for 10–15 minutes and avoid blowing your nose. If bleeding is heavy or does not stop within 20 minutes, seek medical attention. For persistent nasal irritation or discomfort, speak to your pharmacist before attempting another test. If you have a known nasal condition, consult your GP before using any nasal swab-based test.

Can the Flowflex Covid Test Interact With Other Medicines or Products?

As a diagnostic device, the Flowflex test does not interact with medicines in the pharmacological sense. However, certain nasal products can affect the accuracy of the result. Nasal sprays, decongestants, or saline rinses used immediately before testing may dilute or displace the viral antigens in the nasal passage, potentially leading to a false negative. It is recommended to wait at least 30 minutes after using any nasal product before performing the test. Similarly, eating, drinking, or smoking immediately before testing may introduce contaminants that affect the sample.

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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