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What is the cut-off for B12 in the elderly and why is it important?

According to the National Institutes of Health, approximately 21% of adults older than 60 may have abnormal levels of at least one vitamin B12 biomarker, highlighting the importance of understanding what is the cut-off for B12 in the elderly. The standard serum B12 reference range can be misleading for older adults, who are more susceptible to age-related changes affecting nutrient absorption and may experience symptoms even with 'normal' levels.