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In addition to the crossreaction, false positives also can occur because of technician or clerical error--making it important to review the process by which the specimen was obtained and tested if a false-positive result is suspected, as in the case described here.
One approach is to ask explicitly how many false positives one can accept for every false negative, or how many false negatives one can accept for every false positive.
Investigation of false positive results with an oral fluid rapid HIV-1/2 antibody test.
Correlation should serve three major purposes: pulling out remaining false positives, escalating false negatives and enriching threat data.
The problem is that we become overwhelmed by false positives in relation to the relatively rare true positives.
Gann also calculates that the combined test would yield fewer false positive results.