Objective To explore the value of urease pretreatment-gas chromatography-mass spectrometry(UP-GC-MS) in the diagnosis and therapy of methylmalonic aciduria(MMA).

• 目的探讨尿素酶预处理-气相色谱-质谱法(UP-GC-MS)在甲基丙二酸尿症(MMA)诊断、治疗中的价值。