TY - JOUR T1 - Comparison of the radioisotope dilution-coated charcoal method and a microbiological method <em>(L. leichmannii)</em> for measuring vitamin B<sub>12</sub> in serum JF - Journal of Clinical Pathology JO - J Clin Pathol SP - 610 LP - 613 DO - 10.1136/jcp.19.6.610 VL - 19 IS - 6 AU - J. L. Raven AU - P. L. Walker AU - P. Barkhan Y1 - 1966/11/01 UR - http://jcp.bmj.com/content/19/6/610.abstract N2 - A comparison has been made of the radioisotope dilution-coated charcoal method and a microbiological assay (with L. leichmannii as test organism) for determining the concentration of vitamin B12 in serum. A satisfactory correlation was found between the results of the two methods. Under appropriate conditions the reproducibility of the radioisotope method compared favourably with that of the microbiological method. ER -