title: [The vitamin B 12 serum level at various ages].
abstract: A report is presented on the determination of the vitamin B12 content by means of radioassay in the serum of 402 healthy persons aged between 14 to 98 years. With increasing age a significant decrease of the vitamin B12 content could be observed in both sexes after the sixtieth year of age. In the age group between 21 to 30 only the low values of women made an exception, which may be due to the administration of contraceptives.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D003276:Contraceptives, Oral / Q000009:adverse effects; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014805:Vitamin B 12 / Q000097:blood*; D014806:Vitamin B 12 Deficiency / Q000139:chemically induced
chemical_list: D003276:Contraceptives, Oral; D014805:Vitamin B 12
vernacular_title: Der Vitamin-B12-Spiegel im Serum in verschiedenen Altersstufen.