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  2. Should You Use an Expired COVID Test? The Answer Might ... - AOL

    www.aol.com/lifestyle/expired-covid-tests-still...

    But, if your test is expired—both on the box and per the FDA’s updated dating—and you want to be sure you’re getting an accurate reading, Dr. Russo says it’s “probably best to not use ...

  3. Step by step: How to find out whether your test has expired - AOL

    www.aol.com/finance/home-covid-tests-expired...

    Home tests for COVID are getting more costly and multiple tests are recommended after negative results. Here's a way to save money.

  4. What to do if your COVID test expires — or if you test ...

    www.aol.com/covid-test-expires-test-positive...

    To check if your test has expired, visit the FDA website and search for your test’s brand and lot number. If you find out the test is past its shelf life, it’s best to avoid using it.

  5. Test strip - Wikipedia

    en.wikipedia.org/wiki/Test_strip

    A test strip is a band/piece/strip of paper or other material used for biological testing. Specifically, test strip may refer to: Food testing strips; Glucose meter test strip; Lipolysis test strip; Urine test strip; Universal indicator pH test strips; It may also refer to: Teststrip, an art gallery in Auckland, New Zealand

  6. Nitrazine - Wikipedia

    en.wikipedia.org/wiki/Nitrazine

    This test involves putting a drop of fluid obtained from the vagina onto paper strips containing nitrazine dye. The strips change color depending on the pH of the fluid. The strips will turn blue if the pH is greater than 6.0. A blue strip means it's more likely the membranes have ruptured. This test, however, can produce false positives.

  7. Pregnancy test - Wikipedia

    en.wikipedia.org/wiki/Pregnancy_test

    The control line of this pregnancy test is blank, making the test invalid. The control line on the left of this pregnancy test is visible, suggesting that the test result is valid. A pale purple line has also appeared on the right hand side (the test line) which clearly signifies that the subject is pregnant.