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Of the 40 patients (21%) who had baseline serum MMA levels, five had a serum B 12 250 pg/mL

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Additives : Antioxidants or reducing agents (e.g., DTT) may help, but use cautiously as they can interfere with some assays

Oneday Compounds 7-Point Analytical Verification Each batch undergoes independent third-party analytical testing in the United States by a laboratory accredited to ISO/IEC 17025:2017 standards for testing competence and quality systems

Biomarkers of cobalamin (vitamin B-12) status in the epidemiologic setting: a critical overview of context, applications, and performance characteristics of cobalamin, methylmalonic acid, and holotranscobalamin II