Laboratory Medicine ›› 2019, Vol. 34 ›› Issue (10): 932-936.DOI: 10.3969/j.issn.1673-8640.2019.10.015

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Role of gas chromatography-mass spectrometry in inherited metabolic diseases

TIAN Guoli, ZHOU Zhuo, GUO Jing, WANG Yanmin, JI Wei   

  1. Neonatal Screening Center,Shanghai Children's Hospital,Shanghai 200040,China
  • Received:2018-11-09 Online:2019-10-30 Published:2019-11-01

Abstract: Objective To investigate the application of gas chromatography-mass spectrometry(GC-MS) in the diagnosis of inherited metabolic diseases. Methods Urine samples of 5 778 children with suspected inherited metabolic diseases were enrolled. After extraction and derivatization,132 metabolites were detected by GS-MS and analyzed by inherited metabolic disease analysis software. Combined with other laboratory tests,the diagnosis was performed. Results Of the 5 778 urine samples,1 100 cases had abnormal metabolites, accounting for 19%. A total of 106 cases with 17 diseases were diagnosed,among which 80 cases were diagnosed with abnormal characteristics in urine,and 26 cases were diagnosed with blood tandem mass spectrometry. Among the 80 cases,there were 65 cases with 11 types of organic acid metabolic disorders and 15 cases with 3 amino acid metabolic disorders,including 33 cases of methylmalonicmia,12 cases of hyperphenylalaninemia,7 cases of propionic acidemia,7 cases of glutaric acidemia typeⅠ,6 cases of urea circulatory disorders,3 cases of β-ketothiolase deficiency,2 cases of methylmalonic acidemia,2 cases of maple syrup urine disease,2 cases of isovaleric acidemia,2 cases of multiple carboxylase deficiency,1 case of tyrosinemia type Ⅰ,1 case of 2-hydroxyglutaratemia,1 case of 3-methylcrotonyl-CoA carboxylase deficiency and 1 case of 3-hydroxy-3-methylglutaric acidemia. Totally,26 cases were diagnosed by tandem mass spectrometry,including 19 cases of Citrin deficiency,5 cases of very long-chain acyl-CoA dehydrogenase deficiency and 2 cases of medium-chain acyl-CoA dehydrogenase deficiency. Conclusions GC-MS is specific for the abnormality of organic acids and partial amino acid metabolism abnormality. The results of GC-MS are influenced by many factors,but it has no difference in clinical judgment.

Key words: Gas chromatography-mass spectrometry, Inherited metabolic disease, Urine, Metabolite

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