title: A new case of methylmalonic aciduria with unexplained negative urinary methylmalonic colorimetric test.
mesh_terms: D002675:Child, Preschool; D003124:Colorimetry; D005188:False Negative Reactions; D005260:Female; D006801:Humans; D008314:Malonates / Q000652:urine*; D008764:Methylmalonic Acid / Q000652:urine*
chemical_list: D008314:Malonates; D008764:Methylmalonic Acid