What is a false negative test result?

When a screening test show a negative result, but lab (EIMS) test shows positive, the result is called a false negative.  While the illicit drug or drug metabolites are present in the donor’s system their concentration is less than the cutoff level results in a no-show on the test device. Lab (EIMS) tests are, however, much more sensitive and can detect lower drug concentrations. For example, if a patient is taking Oxycodone but the test shows negative—it is a false negative.

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