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www.wwltv.com/article/news/health/coronavirus/coronavirus-what-is-a...

Presumptive Positive case of COVID-19: Anyone who has tested positive for the virus, but testing was conducted at the local or state level. Currently, presumptive positive cases must have sample ...

www.questdrugmonitoring.com/blog/presumptive-drug-testing-rapid-results-for...

Test options can be ordered that include reflex definitive testing to confirm presumptive positive test results. Where presumptive testing may be insensitive, definitive testing may be used to rule out false negative presumptive results. 1. Toxicology CPT Code Changes for 2017.

en.wikipedia.org/wiki/Presumptive_and_confirmatory_tests

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. Clinical consideration and professional judgment should be applied to any drug of abuse test result, in evaluating a preliminary positive result.

www.drugs.com/article/false-positive-drug-tests.html

When initial screening drugs tests (called immunoassays) result in positive results, a second confirmatory (Gas Chromatography Mass Spectrometry or GC-MS) test - which should always be done on positive results - greatly lessens the chance of a false positive, almost reducing the risk to zero. 3 GC-MS is a very specific test to identify separate ...

www.experts.com/articles/presumptive-testing-by-jerald-cook

A negative test may be used to rule out a drug or drug intoxication. A positive test is usually indicative of a class or classes of drugs rather than a specific drug. The results, however, are reported as positive for a specific drug. Without confirmatory testing, a positive presumptive test result can easily be misinterpreted.

www.aafp.org/afp/2019/0101/p33.html

Table 3 lists common medications that can cause false-positive results on urine drug testing.9 Negative results are particularly difficult to interpret, especially when a patient is receiving long ...

www.msn.com/en-us/news/us/coronavirus-what-is-a-presumptive-positive-case-of...

Presumptive Positive case of COVID-19: Anyone who has tested positive for the virus, but testing was conducted at the local or state level. Currently, presumptive positive cases must have sample ...

answersdrive.com/what-is-a-presumptive-test-for-a-drug-7334132

There are two main types of tests used to determine whether an illegal drug is present in a substance: presumptive tests and confirmatory tests.Presumptive tests are less precise and indicate that an illegal substance may be present. Confirmatory tests provide a positive identification of the substance in question.

www.katc.com/news/coronavirus/presumptive-positive-what-does-it-mean

The Louisiana Department of Health explains that a 'presumptive positive' case is conducted by the State Lab in Baton Rouge, and 'presumptive' becomes 'confirmed' after the state's test is ...

www.questdiagnostics.com/dms/Documents/mlcp/JK-NGS/JK_NGS-MLCP-L36037-Urine-Drug...

testing. A presumptive positive IA test detects the presence of a drug/substance in urine at or above the “cut-off” value. If the concentration of the drug is below the cut-off, the result will be negative. Presumptive positive tests are not necessarily definitive due to sensitivity, specificity, and cross-reactivity limitations.