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for clinical laboratory use. The method is simple and precise, enabling comparatively easy processing of large numbers of specimens. The performance characteristics of the method presented here are comparable with those utilizing fluorescence detection. The major advantage of this method is the avoidance of derivatization. The use of penicillamine as an(More)
Because of the increasing significance of folate nutriture to public health, a "round robin" interlaboratory comparison study was conducted to assess differences among methods. Twenty research laboratories participated in a 3-day analysis of six serum and six whole-blood pools. Overall means, SDs, and CVs derived from these results were compared within and(More)
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