Cystine quantitative analysis (Cystine Quantitative, by Liquid Chromatography–Tandem Mass Spectrometry - LC-MS/MS) is a precise laboratory test used to measure cystine levels in the blood. This test is considered essential for diagnosing cystinuria, a hereditary disorder that leads to the accumulation of cystine in organs and tissues. The analysis is performed using advanced liquid chromatography technology, which ensures high accuracy in measuring concentrations. Through this test, physicians can assess the patient’s condition and monitor the effectiveness of treatment, contributing to improved management of the health condition. This test is recommended for individuals who exhibit symptoms related to amino acid disorders or those with a family history of the disease.