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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.
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.
The sensitivity at line A is 100% because at that point there are zero false negatives, meaning that all the negative test results are true negatives. When moving to the right, the opposite applies, the specificity increases until it reaches the B line and becomes 100% and the sensitivity decreases.
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In the most basic sense, there are four possible outcomes for a COVID-19 test, whether it’s molecular PCR or rapid antigen: true positive, true negative, false positive, and false negative.
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.
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] The test was a three-step process ...
Unipath continued to make improvements to its fertility-related products over the years, improving their convenience and reliability of use. Refinements included a urine collector strip on their Clearblue pregnancy test that turns pink to indicate proper urine absorption, thus reducing the chance of a false-negative test by improper use.
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related to: false positive clearblue pregnancy test faint line meaning list