FlowFlex Lateral Flow Covid Self-Tests



(HOME TESTING only not for travel) 

About lateral flow testing

COVID-19 is an acute respiratory infectious disease, and humans are generally susceptible. Those infected by COVID-19 are the main source of infection and the disease is spreading rapidly around the world.

COVID-19 is an unusually problematic disease because most of the people infected are asymptomatic. This means that they do not display any symptoms and unknowingly spread the virus around while they have an active infection. Based on current knowledge, the incubation period of COVID-19 is 1 to 14 days, with most infections taking hold within 3 to 7 days. The main symptoms of the disease include a new or continuous dry cough, a loss of taste or smell, fatigue, and a temperature or fever.

The Certifly Rapid Antigen COVID-19 test is intended for the rapid detection of COVID-19 and has been authorised for use in the home by the MHRA. The test is very easy to complete, and results are available in as little as 15 minutes. When used in conjunction with the Certifly app, your Certifly test results can be used for international travel in regions that accept proof of a negative lateral flow test. Please note that you cannot use Certifly’s testing kit and app in countries that require proof of a negative PCR test.

Qualitative, visual results
in as little as 15 minutes.

No extra equipment or
instruments required.

Store at temperatures between 2 – 30
degrees Celsius.

Sterile swabs, Extraction tubes,
and Buffer included.

Tests feature a procedural internal
control for accurate results.

The Certifly kit is designed and intended for self-test / home use.

When the Certifly test kit is used according to the instructions, it will produce one of three results:



If the Quality Control Line (C-Line) shows a red line, but there is no red line on the Test Line (T-Line), this result is NEGATIVE.



If both the C-Line and the T-Line shows a red line (even if it is faint), this result is POSITIVE.



If there is no red line on the C-Line, regardless of whether there is a line on the T-Line, this result is INVALID and another test has to be taken.

Frequently Asked Questions

What is a rapid antigen test?

A Flowflex rapid antigen test is a chromatographic immunoassay for the detection of antigens specific to SARS-CoV-2 present on the inside of the nostril. The test is taken to:

trick-mark-iconDiagnose infection.

trick-mark-iconTest after infection to see if the virus has cleared.

trick-mark-iconScreen asymptomatic individuals to detect if they care carrying the virus.

Are the tests officially approved?

Yes. The Acon BioTech Flowflex antigen test is CE marked, ISO-approved, and registered with the UK Medicines and Healthcare products Regulatory Agency (MHRA). This means they are safe and can be relied upon to deliver accurate results.

Can I use this test for travel?

No. Please see our other tests for travel. This test is sold purely to self-test for covid.

Can I freeze the antigen test?

No. lateral flow antigen tests should never be frozen. The tests should be refrigerated or stored at room temperature and kept out of direct sunlight. They have a shelf life of 24 months. You should allow your test kit to return to room temperature before use.

Can the antigen test fail?

It’s rare, but yes, the test can fail on rare occasions either by giving an inconclusive result or a false positive/negative. This tends to happen due to user error rather than a fault with the test itself, such as where the patient has not followed the instructions correctly.

DISCLAIMER: All persons intending to use The Flowflex Rapid Lateral Flow Test Kit must rely on their own knowledge and judgment in doing so. While the Flowlfex testing kit has been approved for domestic use by non-healthcare professionals by the MHRA, the buyer is responsible for complying with applicable regulations governing the test and shall use it in accordance with applicable laws, including health and safety regulations, and in accordance with the instructions. (Now Trading Ltd) will not be responsible for any incorrect use and expressly disclaims any liability from the use of the product, failure to follow instructions, or reliance on test results.

This item is exempt from our usual returns policy. This item is non-returnable or exchangeable.