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Most people who take a drug test take a presumptive test, cheaper and faster than other methods of testing. However, it is less accurate and can render false results. The FDA recommends for confirmatory testing to be conducted and the placing of a warning label on the presumptive drug test: "This assay provides only a preliminary result.
Presumptive tests are quick, sensitive and are relatively specific to bodily fluids that give the analyst an idea of what might be present. Confirmatory tests confirm what the biological sample is. In addition to looking for biological material at a crime scene, pieces of evidence can also be examined and analyzed for the presence of DNA.
[1] [2] Serology testing begins with presumptive tests which gives the analyst an indication that a specific bodily fluid may be present, but cannot completely confirm its presence. Following the presumptive tests, confirmatory tests are done on the same sample to confirm what the unknown substance actually is. [3]
The presumptive criteria are designed for use where access to confirmatory diagnostic testing for HIV infection by means of virological testing (usually nucleic acid testing, NAT) or P24 antigen testing for infants and children aged under 18 months is not readily available. Conditions where confirmatory diagnostic testing is necessary:
Conditions where a presumptive diagnosis can be made on the basis of clinical signs or simple investigations [citation needed] Unexplained chronic diarrhoea for longer than one month; Unexplained persistent fever (intermittent or constant for longer than one month) Severe weight loss (>10% of presumed or measured body weight) Oral candidiasis
Nonetheless, the AP won’t call anyone the “presumptive nominee” until a candidate has reached the so-called magic number of delegates needed for a majority at the convention. That’s true ...
The above photo shows the positive results of the number 2 Marquis reagent presumptive drug test when used with a sample of opium. It is the primary presumptive test used in Ecstasy reagent testing kits. It can also be used to test for such substances as opiates (e.g. codeine, heroin), and phenethylamines (e.g. 2C-B, mescaline).
Tulsi Gabbard, President Donald Trump’s nominee to be Director of National Intelligence, testifies at her confirmation hearing before the Senate Intelligence Committee in Washington, DC, on ...