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DISCUSSION The deficiency of vitamin B12 often manifests as hematological and neurological findings

This is significant because 90% of the bodys serotonin is produced in the gut

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Interpreting Your Vitamin B12 Test Results Normal reference ranges for vitamin B12 can vary slightly between labs, but generally: Normal : 200-900 pg/mL Borderline : 200-300 pg/mL (often requires further investigation or clinical correlation) Deficient : 200 pg/mL If your levels are low, your doctor will discuss treatment options, which may include dietary changes, oral supplements, or injections