TABLE 9-8Vitamin B12 Status: Occurrence of Low Serum Values for Two Age Groups

Serum Values of SubjectsHealthy Younger Control Subjectsa
(Number [%])
Elderly Subjects from Framingham Studyb
(Number [%])
Vitamin B12 < 148 pmol/L (201 pg/mL)2 (1.7)29 (5.3)
Vitamin B12 < 258 pmol/L (351 pg/mL)21 (17.9)222 (40.5)
Methylmalonic acid > 376 nmol/LNot available82 (15.0)

NOTE: 1 pmol/L of B12 = 1.36 pg/mL.

a

Aged < 65 years; n = 117.

b

Aged 67–96 years; n = 548.

From: 9, Vitamin B12

Cover of Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline
Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline.
Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes and its Panel on Folate, Other B Vitamins, and Choline.
Washington (DC): National Academies Press (US); 1998.
Copyright © 1998, National Academy of Sciences.

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