I am a doctor and this is how WATER or carbonated drinks can produce false positive side flow

LATERAL line testing is a great way to keep people safe from Covid and if you test positive you must quarantine to prevent the spread of the bug.

Everyone worries about false-positive results in a test – and one doctor has revealed how what you drink can make a difference.

Taking lateral flow tests has become a way of life for Britons trying to navigate the coronavirus pandemic safely


Taking lateral flow tests has become a way of life for Britons trying to navigate the coronavirus pandemic safelyCredit: Rick Findler / Story Picture Agency
NHS doctor Dr Karan Rajan explains why tap water and other drinks could be positive for your test


NHS doctor Dr Karan Rajan explains why tap water and other drinks can test positive

When performing a lateral flow test (LFT), you should read the instructions on the box because each is different and some are made by different manufacturers.

However, one of the main instructions on most pill packs is that you should wait 30 minutes after eating or drinking to take the test.

This is because certain foods and drinks, such as water and carbonated water, can interfere with the test.

Sign up TikTokDr Karan Rajan explains why these popular drinks can produce false positives.

“First we need to look inside the lateral flow generator,” said the NHS doctor.

He added: “This gray box and the part immediately above it contain antibodies that are sensitive to the Covid-19 virus.

“If you use things like soda, tap water and carbonated drinks, that will cause the pH to change, which will affect the function of the antibodies on the test line.

“That’s why you need to use this buffer (consisting of 99.7% saline) that provides a stable pH that will really make the test work.”

🔵 Follow our Covid live blog for all the latest updates

Lateral flow testing is an easy way to detect Covid quickly and it was announced this week that some people who test positive for Covid will not need a follow-up PCR test due to the extent of the spread. of the current virus.

While cases are widespread across the country, most people with Omicron say they are experiencing symptoms similar to those of the common cold.

An extremely positive series of studies show Omicron to be milder than other strains, with the first official UK report showing a 50 to 70 per cent lower risk of hospitalization compared to Delta.

Health officials have repeatedly said the Covid booster shots protect against Omicron and offer the best chance of weathering the pandemic.

The Sun’s Jabs Army campaign is helping to get vital additional vaccines in British arms to avoid the need for any new restrictions.


Like testing, regular testing has become a way of life for the British.

Previous experts have also explained why faint lines can also be false positives.

Post a photo of a vaguely positive lateral flow Instagram, London-based A&E’s Dr. Nathan explains what it means.

“Basically, if *any* lines appear before the end of the explain window (check the leaflet, usually 30 minutes), then this is a *positive* test and you have to get rid of it,” he said. isolate and place PCR.

“However, if a line appears *after* the explain window this does NOT count as a positive test. You don’t need to isolate and you don’t need to set up a PCR.”

But if you have symptoms, regardless of the lateral flow test results, you should isolate and schedule a PCR test.

A complete list of reasons to do a PCR test

In the UK, the reasons to request a PCR test are:

  1. You have Covid symptoms
  2. You have been in contact with someone who tested positive and you must isolate yourself
  3. You have been asked to take the test by your local council or someone from NHS Test and Trace
  4. Your family doctor or other medical professional has asked you to take the test
  5. You are participating in a government pilot project
  6. You have been asked to take a test to confirm a positive result
  7. You received an unclear result and were asked to take a second test
  8. You need to get tested for someone you live with who has symptoms (you can order testing for up to three family members)
  9. You are part of the National Tactical Response Team
  10. You are about to have surgery or a procedure (in some cases)

Exceptions to the lateral flow check rule:

  1. Those eligible for the £500 Test and Traceability Support Payment (TTSP) will still be required to do confirmatory PCR so they can access financial assistance
  2. People participating in research or surveillance programs may still be required to have a follow-up PCR test
  3. Around a million people in the UK at risk of becoming seriously ill from Covid are participating in new research into treatments

The rules can vary from country to country, for example in Scotland you should apply for a PCR test if you have two or more negative side-flow test results.

And in Wales, people in the “clinically vulnerable” group will still need to have a PCR test if their lateral flow is positive but they have no symptoms.


Me and the Tinder date I just met were forced into quarantine after we both tested positive for Covid but all was not bad I am a doctor and this is how WATER or carbonated drinks can produce false positive side flow

Fry Electronics Team

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