If you need more than just Methadone, Quantitative, Serum lab test - add more tests one by one. Phenobarbital (component)Methadone, Quantitative, Serum (test) Phenobarbital (component) Remove item Methadone, Quantitative, Serum (test) Remove item No choices to choose from Please select an item from the autocomplete list Max stores per result: Any 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Verbose: See search details Switch to LabCorp lab tests (similar) Laboratory tests search details Methadone, Quantitative, Serum (test) (remove) Quest test: 2082 (Quest) Components: Methadone No results found