Measurement of serum vitamin B12-related metabolites in newborns: implications for new cutoff values to detect B12 deficiency

Our aim was to determine the prevalence of maternal and neonatal vitamin B12 (vit-B12) and folate deficiencies, a new cutoff value of serum vit-B12 in newborns using vit-B12-related metabolites and also cutoff values of homocysteine (Hcy), propionyl (C3) carnitine, and methyl malonic acid (MMA) in newborns using a vit-B12 cutoff value of 200 pg/mL.Healthy pregnant women (without iron deficiency) and 98 healthy, term, singleton babies were...