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Lateral flow tests for entry to the UK

Lateral flow tests for entry to the UK

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  • ✔️ Detects SARS-CoV-2 antigens rapidly within 15–30 minutes
  • ✔️ CE and UKCA marked for verified UK travel testing compliance
  • ✔️ Suitable for adults and children aged 12 and over
  • ✔️ No laboratory required — accurate results at home or abroad
  • ✔️ Single-use kit with clear illustrated instructions included

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What Is a Lateral Flow Test for Travel to the UK?

 

Planning a trip back to the UK? Whether you're returning from a holiday, a business trip, or visiting family from abroad, understanding your testing requirements is essential. A lateral flow test for travel is a rapid antigen diagnostic device that detects the presence of SARS-CoV-2 proteins in a nasal or throat swab sample. Results are available within 15 to 30 minutes — no laboratory required. At Cured Pharmacy, our lateral flow test kits are CE-marked and UKCA-marked, meeting the standards required for recognised travel testing. If you're also preparing a broader travel health kit, our travel health collection has everything you might need alongside your test.

Entry requirements for the UK have evolved considerably since the pandemic, and while mandatory pre-departure testing has been lifted for most travellers, certain situations — including specific visa categories, employer requirements, or destination-specific rules — may still call for a verified negative test result. Always check the latest guidance from the UK government before you travel, as requirements can change at short notice.

 

How Does a Lateral Flow Test Detect COVID-19?

 

Lateral flow tests use immunochromatographic technology — a method that has been used in medical diagnostics for decades. Here's how the process works:

  • You collect a sample by swabbing your nostrils, throat, or both, depending on the kit instructions.
  • The swab is placed into a small tube containing an extraction buffer solution, which releases viral antigens from the sample.
  • A few drops of this solution are applied to the test cassette.
  • The liquid travels along a nitrocellulose membrane strip, passing over antibody-coated regions.
  • If SARS-CoV-2 antigens are present, they bind to labelled antibodies and produce a visible coloured line at the test (T) region.
  • A control (C) line always appears if the test has worked correctly — if it doesn't, the result is invalid.

The entire process takes between 15 and 30 minutes. It's straightforward, and the kits include illustrated instructions to guide you through each step clearly.

 

Who Should Use a Lateral Flow Test for UK Entry?

 

These tests are designed for adults and older children who need to demonstrate a negative COVID-19 result before or upon arrival in the UK. They're particularly relevant for:

  • Travellers whose employer or institution requires a verified negative test result before return to work or study.
  • Individuals travelling from countries where local authorities still require proof of a negative test.
  • People who want personal reassurance before visiting vulnerable family members after international travel.
  • Those required to test under specific visa or immigration conditions.

If you're unsure whether you need a test, it's always worth checking the official UK government travel pages or speaking to your pharmacist. Testing is a sensible precaution even when not strictly mandated — particularly if you'll be spending time with elderly relatives or immunocompromised individuals after landing.

 

How Does a Lateral Flow Test Compare to a PCR Test for Travel?

 

Feature Lateral Flow Test (This Product) PCR Test
Result time 15–30 minutes 24–72 hours
Sensitivity Moderate–high (best when symptomatic) Very high
Cost From £19.00 Typically £50–£120
Lab required? No — home or point-of-care use Yes — laboratory processing needed

 

Are Lateral Flow Tests Suitable for All Travellers?

 

Most adults and children aged 12 and over can self-administer a lateral flow test for travel safely and accurately at home. Children under 12 should be assisted by an adult. The test is non-invasive, though some people find the nasal swabbing mildly uncomfortable — this is temporary and resolves immediately. If you have a known nasal condition such as a deviated septum or recent nasal surgery, speak to your GP or pharmacist before self-swabbing. You might also want to browse our electrical health and diagnostic range for other monitoring tools to support your health while travelling.

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.

Lateral Flow Tests for Entry to the UK specifications
Treatment category Diagnostic testing / Travel health
Mechanism of action Immunochromatographic antigen detection
Effective for Detection of SARS-CoV-2 antigens
Suitable for Adults and children aged 12 and over (younger children with adult assistance)
Active ingredient N/A — diagnostic device
Pack sizes Single test kit
UK classification Medical device (CE/UKCA marked)
Preparation Nasal/throat swab with extraction buffer
Route of administration Nasal or throat swab (self-administered)

Specifications of Lateral Flow Tests for Entry to the UK

 

What Is a Lateral Flow Test and What Is It Used For?

 

A lateral flow test is a rapid, point-of-care diagnostic device used to detect the presence of SARS-CoV-2 antigens — the proteins produced by the coronavirus — in a nasal or throat swab sample. Unlike a PCR test, which requires laboratory analysis, a lateral flow test produces a result within 15 to 30 minutes and can be performed at home, at an airport, or at any convenient location before travel.

These tests are used by travellers who need to confirm a negative COVID-19 result before or after international travel, by employers requiring staff to test before returning to work, and by individuals who want personal reassurance before visiting vulnerable people. They are not intended to replace clinical diagnosis — if you have symptoms of COVID-19, seek medical advice regardless of your test result.

 

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

 

Before using this test, read the instructions carefully. There are a few important points to be aware of:

  • Do not use the test if the packaging is damaged or the seal is broken.
  • Do not eat, drink, smoke, or chew gum for at least 30 minutes before taking a throat swab.
  • Do not use nasal sprays or decongestants immediately before swabbing, as these may affect the result.
  • Do not read the result after 30 minutes — results interpreted outside this window are unreliable.
  • A negative result does not guarantee you are free from infection, particularly in the early stages of illness.
  • If you have symptoms consistent with COVID-19, do not travel regardless of your result.

Drug interactions: This is a diagnostic device, not a medicine. There are no known drug interactions. However, certain nasal preparations may interfere with swab sample quality.

  • Nasal corticosteroid sprays — rinse nostrils with water before swabbing if possible.
  • Saline nasal rinses — allow at least 30 minutes before testing.

 

How Should You Use a Lateral Flow Test Correctly?

 

Follow these steps carefully to ensure an accurate result. Incorrect technique is one of the most common reasons for false negatives, so take your time.

  1. Wash your hands thoroughly with soap and water for at least 20 seconds, or use hand sanitiser.
  2. Open the kit and lay out all components: the test cassette, swab, extraction buffer tube, and result card.
  3. Remove the swab from its packaging without touching the tip.
  4. Insert the swab approximately 2–3 cm into one nostril and rotate gently 5 times against the nasal wall. Repeat in the other nostril using the same swab. Alternatively, swab the back of your throat as directed by the specific kit instructions.
  5. Place the swab into the extraction buffer tube and stir or rotate for 15 seconds. Squeeze the tube as you remove the swab to extract as much liquid as possible.
  6. Attach the nozzle cap to the tube and apply 3–4 drops of the solution to the sample well on the test cassette.
  7. Set a timer for 15 minutes. Read the result between 15 and 30 minutes — not before, not after.
  8. Interpret the result: two lines (C and T) = positive; one line (C only) = negative; one line (T only) or no lines = invalid — repeat with a new kit.
User Group Swab Method Assistance Required?
Adults (18+) Self-administered nasal or throat swab No
Children (12–17) Self-administered with adult supervision Recommended
Children (under 12) Adult-administered nasal swab Yes — adult must perform

If you're travelling with young children, our baby and toddler health range includes additional products to keep little ones comfortable during travel.

 

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

 

As a diagnostic device rather than a medicine, lateral flow tests do not cause systemic side effects. However, the physical process of swabbing can occasionally cause minor discomfort.

Common side effects:

  • Mild nasal discomfort or irritation during or after swabbing
  • Temporary watering of the eyes triggered by nasal swabbing
  • Sneezing during or immediately after the nasal swab

Less common side effects:

  • Minor nosebleed, particularly in individuals with sensitive nasal passages or those on anticoagulant medicines
  • Gagging reflex if a throat swab is used
  • Anxiety or distress in young children during the swabbing process

All of these effects are transient and resolve within minutes. If you experience a nosebleed that does not stop within 10 minutes, seek medical advice. If you are on blood-thinning medicines, take extra care when inserting the nasal swab.

 

How Should You Store a Lateral Flow Test Kit?

 

Correct storage is important to maintain the accuracy of the test. An improperly stored kit may give unreliable results.

  • Store at room temperature, between 2°C and 30°C.
  • Keep away from direct sunlight, heat sources, and moisture.
  • Do not freeze the kit — freezing damages the antibody-coated membrane.
  • Keep in the original sealed packaging until ready to use.
  • Check the expiry date printed on the outer box before use — do not use an expired kit.
  • Keep out of reach of children.
  • 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.

If you're building a complete travel health kit, you might also find our first aid collection useful for covering all your bases before you fly.

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 test for travel to the UK online?

You can order a lateral flow test for travel directly from Cured Pharmacy online, with fast dispatch to your home address. The kit arrives ready to use with full instructions included. Simply add to your basket and complete your order — no prescription needed.

Do I still need a lateral flow test to enter the UK in 2024?

Mandatory pre-departure COVID-19 testing for entry to the UK was removed for most travellers in 2022. However, some employers, educational institutions, or specific visa categories may still require a verified negative test result. Always check the latest UK government travel guidance before your trip, as rules can change.

How does a lateral flow test work to detect COVID-19?

A lateral flow test detects SARS-CoV-2 antigens — proteins from the virus — in a nasal or throat swab sample using immunochromatographic technology. The sample travels along a test strip and binds to antibodies, producing a visible line if the antigen is present. Results are ready in 15 to 30 minutes without any laboratory equipment.

How do I use a lateral flow test step by step?

Wash your hands, then swab both nostrils (rotating 5 times in each) or the back of your throat as directed. Place the swab in the extraction buffer tube, stir, then apply 3–4 drops to the test cassette. Read the result between 15 and 30 minutes — two lines means positive, one line (C only) means negative, and no C line means the test is invalid.

When should I take a lateral flow test before flying to the UK?

The timing of your test will depend on the specific requirements of your employer, institution, or travel destination — not a universal UK government rule for most travellers. If a test is required, it is typically taken within 24–48 hours of departure. Always confirm the exact timing requirement with whoever is requesting the test result.

What does a positive lateral flow test result mean for my travel plans?

A positive result indicates the presence of SARS-CoV-2 antigens and means you should not travel. You should self-isolate immediately and follow the health guidance of the country you are currently in. Contact your airline or travel provider as soon as possible to discuss rebooking options.

Can a lateral flow test give a false negative result?

Yes — lateral flow tests can occasionally produce false negative results, particularly in the very early stages of infection before viral load is high enough to detect, or if the swab technique is incorrect. If you have symptoms of COVID-19, do not rely solely on a lateral flow result and seek clinical advice. A PCR test offers higher sensitivity if there is clinical concern.

Who is eligible to use a lateral flow test for UK entry?

Lateral flow tests are suitable for most adults and children aged 12 and over when self-administered. Children under 12 can be tested with adult assistance using a gentle nasal swab technique. People with nasal conditions such as recent nasal surgery should speak to their GP before self-swabbing.

How accurate are lateral flow tests compared to PCR tests?

PCR tests are generally more sensitive than lateral flow tests, particularly in detecting low viral loads in the early stages of infection. Lateral flow tests perform best when a person is symptomatic and viral load is higher. For most travel purposes where a rapid result is needed, a lateral flow test is a practical and widely accepted option.

What happens if my lateral flow test result is invalid?

An invalid result — where no control (C) line appears — means the test has not worked correctly and the result cannot be interpreted. This can happen if insufficient liquid was applied, the test was read outside the 15–30 minute window, or the kit was stored incorrectly. You should repeat the test using a new kit.

Are lateral flow tests safe for children?

Yes, lateral flow tests are safe for children when used correctly. Children under 12 should have the test administered by an adult, using a gentle technique to minimise discomfort. The nasal swab may cause brief discomfort or trigger sneezing, but this resolves immediately. If your child is distressed, a throat swab may be easier to tolerate.

How should I store a lateral flow test kit before use?

Store your lateral flow test kit at room temperature between 2°C and 30°C, away from direct sunlight, heat, and moisture. Do not freeze the kit, as this damages the antibody membrane and will affect accuracy. Always check the expiry date on the outer packaging before use.

What are the alternatives to a lateral flow test for UK travel?

The main alternative is a PCR test, which offers higher sensitivity but requires laboratory processing and typically takes 24–72 hours for results. PCR tests are generally more expensive, ranging from £50 to over £100. For travellers needing a quick result, a lateral flow test is a more practical and affordable option. You can also explore our electrical health and diagnostic range for other health monitoring tools.

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

Used lateral flow test components — including the swab, cassette, and buffer tube — should be placed in a sealed plastic bag and disposed of in your household waste bin. Do not place used test materials in recycling. If you tested positive, follow local authority guidance on disposing of clinical waste safely.

Can I use a lateral flow test if I have recently had COVID-19?

Yes, but be aware that some people who have recently recovered from COVID-19 may continue to test positive on lateral flow tests for several weeks after their infectious period has ended, due to residual antigen fragments. If you have recently recovered and are still testing positive, seek advice from your GP or pharmacist before travelling. You can also browse our cold and flu range for supportive products during recovery.

How Should You Use a Lateral Flow Test for UK Entry?

Using your lateral flow test correctly is essential for an accurate result. Before you begin, make sure you have not eaten, drunk, smoked, or used a nasal spray for at least 30 minutes. Lay all components out on a clean, flat surface and read the instructions included in your kit before starting.

Follow these steps carefully:

What Is the Correct Dose of a Lateral Flow Test?

This is a single-use diagnostic device, not a medicine — there is no "dose" in the traditional sense. Each kit is designed for one test only and must not be reused. If your result is invalid, use a fresh kit.

When Is the Best Time to Use a Lateral Flow Test Before Travel?

The optimal time to test depends on the specific requirements of whoever is requesting your result — your employer, institution, or travel destination. In general, testing within 24 to 48 hours of your departure gives the most clinically relevant result, as it reflects your infection status closest to the time of travel.

Avoid testing too early, as a negative result taken several days before departure does not guarantee you were not exposed to the virus in the intervening period. If you develop symptoms after testing negative, do not travel and retest immediately.

How Long Can You Use a Lateral Flow Test For?

Each lateral flow test kit is a single-use device and should only be used once. The kit has a printed expiry date on the outer packaging — do not use the test after this date, as the antibody-coated membrane degrades over time and results may be unreliable.

If you are travelling frequently and need to test on multiple occasions, you will need a separate kit for each test. Store unused kits correctly between uses to preserve their accuracy until the expiry date.

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

How Should You Use a Lateral Flow Test for UK Entry?

Using your lateral flow test correctly is essential for an accurate result. Before you begin, make sure you have not eaten, drunk, smoked, or used a nasal spray for at least 30 minutes. Lay all components out on a clean, flat surface and read the instructions included in your kit before starting.

Follow these steps carefully:

What Is the Correct Dose of a Lateral Flow Test?

This is a single-use diagnostic device, not a medicine — there is no "dose" in the traditional sense. Each kit is designed for one test only and must not be reused. If your result is invalid, use a fresh kit.

When Is the Best Time to Use a Lateral Flow Test Before Travel?

The optimal time to test depends on the specific requirements of whoever is requesting your result — your employer, institution, or travel destination. In general, testing within 24 to 48 hours of your departure gives the most clinically relevant result, as it reflects your infection status closest to the time of travel.

Avoid testing too early, as a negative result taken several days before departure does not guarantee you were not exposed to the virus in the intervening period. If you develop symptoms after testing negative, do not travel and retest immediately.

How Long Can You Use a Lateral Flow Test For?

Each lateral flow test kit is a single-use device and should only be used once. The kit has a printed expiry date on the outer packaging — do not use the test after this date, as the antibody-coated membrane degrades over time and results may be unreliable.

If you are travelling frequently and need to test on multiple occasions, you will need a separate kit for each test. Store unused kits correctly between uses to preserve their accuracy until the expiry date.

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

What Are the Most Common Side Effects of a Lateral Flow Test?

Because a lateral flow test is a diagnostic device rather than a medicine, it does not cause systemic side effects. The most commonly reported effects relate to the physical process of nasal or throat swabbing, and all are temporary.

  • Mild nasal discomfort or irritation during swabbing
  • Watering eyes triggered by nasal stimulation
  • Sneezing during or immediately after the nasal swab
  • Brief gagging reflex if a throat swab is used

These effects resolve within seconds to minutes and require no treatment. If you find nasal swabbing particularly uncomfortable, try breathing slowly through your mouth during the process.

What Are the Less Common Side Effects of a Lateral Flow Test?

Less commonly, some people experience slightly more noticeable reactions, particularly those with sensitive nasal passages or underlying nasal conditions.

  • Minor nosebleed following nasal swabbing, especially in people with fragile nasal mucosa
  • Temporary nasal congestion or runny nose after swabbing
  • Anxiety or distress in young children during the procedure
  • Skin irritation around the nostrils if swabbing is repeated frequently

If you are taking anticoagulant medicines such as warfarin or apixaban, take extra care when inserting the nasal swab, as your risk of minor bleeding may be slightly higher.

What Are the Serious Side Effects of a Lateral Flow Test?

Serious adverse effects from lateral flow testing are extremely rare. The test does not involve any medicines, chemicals absorbed into the body, or invasive procedures. However, in very rare cases, vigorous or incorrect swabbing could cause mucosal trauma. If you experience a nosebleed that does not stop within 10 minutes of applying gentle pressure, seek medical attention.

Allergic reactions to the components of the test kit are theoretically possible but have not been widely reported. If you notice swelling, rash, or difficulty breathing after handling the kit, seek emergency medical help immediately.

What Should You Do If You Experience Side Effects?

For minor discomfort such as nasal irritation or sneezing, no action is needed — these resolve on their own. If you experience a nosebleed, sit upright, pinch the soft part of your nose, and hold for 10 minutes without releasing. Do not tilt your head back.

If you are concerned about any reaction after using the test, contact your pharmacist or GP for advice. For severe reactions such as difficulty breathing or significant swelling, call 999 immediately.

Can a Lateral Flow Test Interact With Other Medicines?

As a diagnostic device, a lateral flow test does not interact with medicines in the way that drugs do. However, certain nasal preparations may affect the quality of your swab sample and potentially influence the result. These include nasal corticosteroid sprays, saline rinses, and decongestant nasal sprays. Where possible, avoid using these products for at least 30 minutes before swabbing to minimise any potential interference with the test result.

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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