The measurement of urinary methylmalonic acid by a combination of thin-layer and gas chromoatography.
D002247:Carbon Isotopes; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D006801:Humans; D008314:Malonates / Q000652:urine*; D008657:Metabolic Clearance Rate; D008722:Methods; D014633:Valine / Q000378:metabolism; D014806:Vitamin B 12 Deficiency / Q000175:diagnosis
D002247:Carbon Isotopes; D008314:Malonates; D014633:Valine