There are a number of point-of-care, or rapid tests, for drugs-of-abuse testing available currently; the most commonly used is the multi-drug test dip panel, but multiline cassette type urine drug tests are also available and at my personal point of view they are even better. All of these use immunoassays, similar to the more commonly used automated instrument assays. I have referenced several comparison studies of these assays with automated immunoassays and GCMS confirmatory testing methods. [1-4] In general, the analytical performance of these assays was similar to that of more traditional techniques. One study found that EZ-Screen did not appear to adhere to standard or specified cutoff concentrations, reporting as positive samples that were below the specified cutoff values.
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