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. 1969 Mar;22(2):205–211. doi: 10.1136/jcp.22.2.205

Improved method for measuring vitamin B12 in serum using intrinsic factor, 57CoB12, and coated charcoal

J L Raven 1, M B Robson 1, P L Walker 1, P Barkhan 1
PMCID: PMC474034  PMID: 5776552

Abstract

An improved and simplified method is described for the measurement of vitamin B12 in serum using intrinsic factor, 57CoB12, and coated charcoal. The extraction of serum in the presence of cyanide and the incorporation of B12-deficient serum into the intrinsic factor control has increased the accuracy of the method for both sera and crystalline B12 solutions. There are interesting differences between the results obtained for some sera by the isotope and L. leichmannii methods and the reasons for these differences are discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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