The Amitriptyline serum test using Liquid Chromatography–Tandem Mass Spectrometry (LC-MS/MS) is an important tool for evaluating the levels of this medication in the blood. Amitriptyline is commonly used to treat depression and certain psychiatric disorders. This test helps doctors monitor treatment effectiveness and adjust the necessary dosage, contributing to improved patient outcomes and preventing potential side effects. It is recommended that this test be performed regularly for patients who take amitriptyline long-term or those with other health conditions that may affect the drug’s metabolism.