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  • A vitamin B-12 test system is a device intended to measure vitamin B-12 in serum, plasma, and urine. Measurements obtained by this device are used in the diagnosis and treatment of anemias of gastrointestinal malabsorption. (Note: the representation for the vitamin used in the published regulation has been replaced by the expression ``B-12\'\' because it could not be rendered in ASCII text--This parenthesis is not in the regulation.).
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