Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (1) Enzyme-Linked Immunosorbent Assay (ELISA) (1) (-) Gas Chromatography (GC) (2) Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS) (1) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Headspace Gas Chromatography (GC) (1) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (17) High Performance Liquid Chromatography/Time of Flight-Mass Spectrometry (LC/TOF-MS) (2) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (3) Sample Type (-) Blood (2) Serum or Plasma (1) Tissue (1) Urine (5) Test Area Therapeutics (2) Test Category Antidepressants (2) Test Sub-Category Tricyclic (2) Test Test Name 3220B Nortriptyline, Blood 9433B Nortriptyline Screen, Blood