Laboratory testing & validity

Initial and confirmatory drug tests, cutoff concentrations, validity testing (creatinine, pH, specific gravity, oxidant testing), HHS-certified laboratory requirements.

A commercial driver’s primary urine specimen was reported as a confirmed positive for benzoylecgonine. The driver timely requested a test of the split specimen. The second HHS-certified laboratory analyzed the split specimen but could not reconfirm the presence of the cocaine metabolite. What is the second laboratory's required next step?

A.Perform validity testing on the split specimen to investigate the potential reason for the failure to reconfirm.

B.Report the result as negative to the MRO if the benzoylecgonine concentration is below the 100 ng/mL confirmatory cutoff.

C.Immediately notify the MRO that the result is 'Failed to Reconfirm' without performing further testing.

D.Return the split specimen to the primary laboratory to determine if the original analysis was flawed.