LabCorp MedWatch®: ToxAssure® Testing ToxAssure® provides physicians with the full-spectrum of a patient’s drug use, including the identification of prescribed, unprescribed, over-the-counter, and illicit drugs.   LabCorp, including its specialty testing laboratory, MedTox Laboratories, offers state-of-the-art, ultra high performance liquid chromatography and tandem mass spectrometry (UPLC/MS-MS) test options that can analyze as many as 180 drug compounds on a single, LC/MS-MS analysis platform. LabCorp Pain medicine News AD