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Case Report
Genetics and Metabolism
Maternal 3-methylcrotonyl-coenzyme A carboxylase deficiency with elevated 3-hydroxyisovalerylcarnitine in breast milk
Kyung Lae Cho, Yeo Jin Kim, Song Hyun Yang, Gu-Hwan Kim, Jun Hwa Lee
Clin Exp Pediatr. 2016;59(Suppl 1):S41-S44.   Published online November 30, 2016

We report here a case of maternal 3-methylcrotonyl-coenzyme A carboxylase (3-MCC) deficiency in a Korean woman. Her 2 infants had elevated 3-hydroxyisovalerylcarnitine (C5-OH) on a neonatal screening test by liquid chromatography-tandem mass spectrometry (LC-MS/MS), but normal results were found on urine organic acid analysis. The patient was subjected to serial testing and we confirmed a maternal 3-MCC deficiency by blood...

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