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Yield of Low Serum Vitamin B12 Results in General Pediatric Outpatient Practice: Age-Specific Patterns and Associations with Testing Indications and Recorded Clinical Features

Background/Objectives: Serum vitamin B12 testing is frequently ordered in pediatric outpatient practice, either routinely or incidentally as part of broad laboratory panels or in response to symptoms and nutritional concerns; however, how the yield of low serum vitamin B12 result...