Collaborative post by another author.
I'm sure we all have a little stash of lateral flow tests in the house. Since the early days of COVID-19 they've become a part of our lives, a simple way to get peace of mind before visiting family or going to an event. But like so many other things in the cupboard, they have an expiry date. And it's a date we really shouldn't ignore.
An expired test can give you a result you can't trust. It's just like using out-of-date food in a recipe; it's not going to work the way it's supposed to. So, whether you have a box you got a while ago or you are about to order Lateral Flow Tests online, it’s vital to know how to check the date and what it means.
Understanding Lateral Flow Test Expiry
Why the Expiration Date Matters
Every single lateral flow test kit has an expiry date clearly shown on the box. This date is important because it tells you how long the test will be at its most reliable. The test contains little reactive chemicals that are designed to detect the virus's proteins. Over time, these chemicals can break down and lose their effectiveness.
After the expiration date, the test's ability to accurately detect a virus infection may be reduced. That means you could get a result that isn't correct. The whole point of the test is to give you a clear answer, so using a test that has expired defeats the purpose.
The Risk of an Inaccurate Result
When a lateral flow test's components lose their potency, you run the risk of an inaccurate result. A false negative is a bad outcome because it might tell you that you don't have the virus when you actually do. This could lead to you unknowingly passing it on to other people.
On the other hand, an expired test could give you a false positive result. This might cause unnecessary worry and lead you to self-isolate when you don't need to. It's really important to treat any result from an expired test with caution. If you are experiencing symptoms associated with COVID-19, it's always best to use a new, in-date test. If you are ever unsure, you can also get a follow-up PCR test or seek medical advice to be sure of your health status.
Manufacturing Date and Expiry
The expiry of lateral flow tests is calculated from the manufacturing date, which is usually stamped on the box. Manufacturers estimate how long the test components will operate at peak effectiveness. After the expiration date, which is clearly indicated, you may find that the test's ability to detect the virus with precision decreases.
Indicators of Expiry
Signs that a lateral flow test may have expired include a past expiration date on the packaging and possible discoloration of test components. If you use an expired test, the risk of false negatives or false positives increases, impacting the subsequent health decisions you make. It's crucial to check the packaging for the expiry date before conducting the test.
My Advice: Always Check the Box
The simplest way to ensure your lateral flow test is reliable is to always check the expiration date on the packaging before you use it. Don't use any test that has passed its date, even if it's only by a day or two.
A little bit of caution can make a big difference in keeping yourself and others safe.
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