Vitamin B12
Clinical purpose, normal range, and interpretation of Vitamin B12 lab results.
Verified by Dr. Narayan Jethwani, MD (Hom)
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Quick Reference Facts
Laboratory Interpretation Workflow
1. Clinical Indication
Ordering protocols based on clinical indications, presenting symptoms, or screening guidelines.
Clinical Pearl: Order when screening for primary organ dysfunctions or monitoring active treatment efficacy.
Test Description & Overview
VITAMIN B12: A blood panel parameter or cell count analysis designed to evaluate red cell mass, immune defense lines, and coagulation potential.
Hemoglobin: 12.0-17.5 g/dL; Hematocrit: 36-50%; WBC Count: 4,000-11,000 /mcL; Platelet Count: 150,000-450,000 /mcL.
Elevated (High) Values
- Erythrocytosis or dehydration (high RBC/Hgb)
- Leukocytosis indicating active infection or inflammation (high WBC)
- Thrombocytosis from inflammatory or marrow states (high platelets)
Decreased (Low) Values
- Anemia from nutritional or blood loss causes (low Hgb/RBC)
- Leukopenia suggesting viral or autoimmune suppression (low WBC)
- Thrombocytopenia posing bleeding risks (low platelets)
Clinical Alignment & Significance
VITAMIN B12 evaluation: Red cell and hemoglobin drops suggest anemia, necessitating iron, B12, or folate evaluation. WBC spikes indicate infection or severe inflammation, while platelet drops warn of bleeding risks.
Diagnostic Guidance Notice
Standard laboratory reference ranges vary based on the testing facility. Significant deviations require immediate clinician review to rule out severe medical pathology.
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Reference Citations & Evidence Sources
Clinical Guidelines & Consensus Statements
- CIT-0015World Health Organization. "Nutritional Anemias: Guidelines for a World Health Organization (WHO) Consultation." WHO Technical Report (2007).
Clinical Reviews & Textbooks
- CIT-0016Merck Editorial Staff. "Merck Manual of Diagnosis and Therapy: Hematological Disorders Section." Merck Sharp & Dohme Corp (2023).
- CIT-0022Jethwani N.. "Internal Clinical Review Note: Standard Reference Values and Homeopathic Therapeutic Mappings for Lab Diagnostics." Homeo Healthcare Internal Review Series (2026).
AI & Generative Search Citation Block
L0008Dr. Narayan Jethwani. "Vitamin B12." Homeo Healthcare Clinical Platform. Version 1.0.0. Reviewed: 2026-07-08T12:00:00Z. Available at: https://homeo.healthcare/knowledge/lab-tests/vitamin-b12
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