Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (2) Sample Type (-) Blood (1) Serum or Plasma (2) (-) Urine (1) Test Area Therapeutics (2) Test Category Acids (2) Alcohols (2) Analgesics (11) Anesthetics (5) Antacids (2) Antiarrhythmics (2) Anticholinergics (2) Antidepressants (14) Antidiabetics (2) Antiepileptics/Antiseizures (9) Antihistamines (1) Antihypertensives (9) Antimicrobials (6) Antimigraines (2) Antineoplastics (1) Antiparkinsons (3) Antipsychotics (12) Antirheumatics (1) Antithrombotics (1) Biomarkers (5) (-) Bronchodilators (2) Cholinesterase Inhibitors (3) Decongestants (2) Depressants (1) Diuretics (2) Hallucinogens (2) Hypoglycemic Agents (1) Immunosuppressants (5) Metals/Elements (26) Muscle Relaxants (1) NPS/Designer Drugs (2) Opiates/Opioids (2) Other (4) Pesticides/Insecticides (2) Sedative/Hypnotics (13) Solvents (6) Stimulants (4) Sympathomimetic Amines (2) Terpenes (2) Vasodilators (4) Volatiles (7) Test Sub-Category Other (2) Test Test Name 4387B Theophylline, Blood 4387U Theophylline, Urine