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What an elevated serum B12 represents, and why no single threshold exists A serum B12 reflects vitamin bound to transport proteins in the blood, not the amount that has reached the tissues, and the threshold for calling it high shifts with the assay, the laboratory, reference interval, and the unit on the report

These categories can overlap in how they feel

Biochemistry and clinical chemistry of vitamin B12 transport and the related diseases

Injectable Administration: Subcutaneous (under the skin) or intramuscular (into the muscle) injections are common routes, especially when targeting a specific injury site for quicker and potentially higher localized delivery

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