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  2. Got a Faint Line on a COVID-19 Home Test? Here's What ... - AOL

    www.aol.com/got-faint-line-covid-19-145700240.html

    "A faint positive line on a home test after recovering from COVID-19 symptoms is an indication of viral proteins being present — therefore, that person may be still contagious."

  3. What does a faint line on a rapid COVID-19 test mean? - AOL

    www.aol.com/faint-line-covid-19-test-225851470.html

    From there, you should know what your results actually mean, including a faint positive line, and when to take another test or get a more sensitive COVID-19 test from your doctor to clear things up.

  4. Does a Faint Line on a COVID Test Mean You Have COVID? - AOL

    www.aol.com/does-faint-line-covid-test-130000248...

    “A faint line on a COVID test means the test is positive,” says infectious disease expert Amesh A. Adalja, M.D., a senior scholar at the Johns Hopkins Center for Health Security.

  5. False positives and false negatives - Wikipedia

    en.wikipedia.org/wiki/False_positives_and_false...

    The false positive rate (FPR) is the proportion of all negatives that still yield positive test outcomes, i.e., the conditional probability of a positive test result given an event that was not present. The false positive rate is equal to the significance level. The specificity of the test is equal to 1 minus the false positive rate.

  6. Staining - Wikipedia

    en.wikipedia.org/wiki/Staining

    Unlike negative staining, positive staining uses basic dyes to color the specimen against a bright background. While chromophore is used for both negative and positive staining alike, the type of chromophore used in this technique is a positively charged ion instead of a negative one. The negatively charged cell wall of many microorganisms ...

  7. Clearblue - Wikipedia

    en.wikipedia.org/wiki/Clearblue

    Clearblue was introduced in 1985 with the launch of the first Clearblue Home Pregnancy Test system, which at the time was owned by Unilever. [4] It was the world’s first “rapid home test” that gave pregnancy test results in 30 minutes and allowed a woman to take a test before going to the doctor. [ 4 ]

  8. So You Got A Faint Positive On Your COVID-19 Rapid Test... - AOL

    www.aol.com/lifestyle/got-faint-positive-covid...

    If your COVID-19 rapid test turns positive, but the line is faint, unfortunately it still means you have COVID. However, a re-test might be in your future.

  9. Kastle–Meyer test - Wikipedia

    en.wikipedia.org/wiki/Kastle–Meyer_test

    Upon reduction, the very intense pink color of the cationic form of phenolphthalein fades to a faint yellow color. It is this form of phenolphthalein that is present in Kastle–Meyer test kits. In order to generate the intense pink color indicative of a positive test, the reduced phenolphthalein must be oxidized back to its normal, colored form.