Ask X3What does 49 CFR 40.181 (What does the second laboratory do with the split specimen when it is tested to reconfirm a substituted test result?) require?
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According to 49 CFR 40.181, when testing a urine split specimen to reconfirm a substituted test result, the second laboratory must perform confirmatory tests for creatinine and specific gravity. These tests must follow the criteria outlined in § 40.88.
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