U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 49Chapter APart 40Subpart H - Subpart H—Split Specimen Tests
§ 40.171 - How does an employee request a test of a split specimen?
§ 40.173 - Who is responsible for paying for the test of a split specimen?
§ 40.175 - What steps does the first laboratory take with a split specimen?
§ 40.177 - What does the second laboratory do with the split specimen when it is tested to reconfirm the presence of a drug or drug metabolite?
§ 40.179 - What does the second laboratory do with the split specimen when it is tested to reconfirm an adulterated test result?
§ 40.181 - What does the second laboratory do with the split specimen when it is tested to reconfirm a substituted test result?
§ 40.183 - What information do laboratories report to MROs regarding split specimen results?
§ 40.185 - Through what methods and to whom must a laboratory report split specimen results?
§ 40.187 - What does the MRO do with split specimen laboratory results?
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