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If a higher dosage produces nothing, then this was a false positive. PLUS ONE, n. (+) The drug is quite certainly active. The chronology can be determined with some accuracy, but the nature of the drug's effects are not yet apparent. PLUS TWO, n. (++) Both the chronology and the nature of the action of a drug are unmistakably apparent.
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.
A positive test usually is > 200 units/mL, [1] but normal ranges vary from laboratory to laboratory and by age. [2] The false negatives rate is 20 to 30%. [1] If a false negative is suspected, then an anti-DNase B titre should be sought. False positives can result from liver disease and tuberculosis. [1]
Use of efavirenz can produce a false positive result in some urine tests for marijuana. [17] [18] Efavirenz may lengthen the QT interval so should not be used in people with or at risk of torsades de pointes. [19] Efavirenz may cause convulsions in adult and pediatric populations who have a history of seizures. [3]
Cross-reactivity, in a general sense, is the reactivity of an observed agent which initiates reactions outside the main reaction expected.This has implications for any kind of test or assay, including diagnostic tests in medicine, and can be a cause of false positives.
New York’s prison system unfairly punished more than 2,000 prisoners after tests of suspected contraband substances falsely tested positive for drugs, according to a report released Thursday.
Stoli. Stoli Group USA, the owner of the namesake vodka, filed for bankruptcy in December. A number of things went wrong for the unit, including a slowing demand for spirits, a major cyberattack ...
The reason is that the test may be falsely normal (false negative) in many cases or abnormally elevated in people who have no cancer (false positive) in others. The main use of CA19-9 is therefore to see whether a pancreatic tumor is secreting it; if that is the case, then the levels should fall when the tumor is treated, and they may rise ...