The 24-hour urine cystine test assesses individuals undergoing cystine-binding thiol drugs (CBTDs) treatment for cystinuria. It is a fundamental component of preventive therapy for individuals prone to forming cystine stones. Typically recommended 1–2 months after implementing dietary changes or pharmacotherapy, this test allows healthcare professionals to fine-tune the levels of CBTDs.
metabolism or carnitine deficiency, which can lead to muscle weakness, fatigue, and other symptoms.