Laboratory testing & validity

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

An MRO receives a laboratory report for a urine specimen showing a creatinine concentration of 24 mg/dL. The report does not include a value for specific gravity. In evaluating whether the laboratory complied with the mandatory validity testing sequence, which of the following is correct?

A.The laboratory correctly omitted the specific gravity test because it is only required when the creatinine concentration is less than 20 mg/dL.

B.The laboratory failed to follow proper procedure because specific gravity must be measured on every primary specimen regardless of the creatinine result.

C.The laboratory was required to measure specific gravity only if the specimen pH was also found to be outside the range of 4.5 to 9.0.

D.The laboratory should have measured specific gravity first and only proceeded to creatinine testing if the specific gravity was less than 1.0030.