Confirmatory Screening & MRO Services and Processes:
It is recommended that confirmatory laboratory tests be done for all non-negative on-site tests and conducted at an appropriate laboratory using GC/MS (gas chromatography / mass spectrometry) procedures. Chain of custody documentation and MRO (Medical Review Officer) services are also important elements of a drug screening program. A confirmatory test is defined within SAMS as an oral fluid sample, taken during the same session with the employee as the on-site initial screen, which is appropriately identified, packaged, and sent to an appropriate test laboratory for GC/MS confirmatory screening. It is recommended that an MRO (an appropriate M.D. or osteopath) review the confirmatory test results and make a final (Positive or Negative) determination. The MRO makes a final determination makes the “final determination as to whether a sample is “positive” or “negative” for drug abuse after reviewing the laboratory results and communicating with the donor as required. For example, an employee may have a current prescription for medication, and/or recently taken over the counter medication responsible for producing a non-negative result for either or both, the on-site test, or the lab-based GC/MS test.
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