Detection of cobalamin deficiency using the urinary methylmalonic acid test by gas chromatography mass spectrometry.
E J
EJ
Norman
D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008764:Methylmalonic Acid / Q000652:urine*; D014806:Vitamin B 12 Deficiency / Q000652:urine*
D008764:Methylmalonic Acid