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Related Experiment Videos

Vitamin B12 deficiency.

Robert Oh1, David L Brown

  • 1U.S. Army Health Clinic, Darmstadt, Germany. roboh98@yahoo.com

American Family Physician
|March 20, 2003
PubMed
Summary
This summary is machine-generated.

Vitamin B12 deficiency can cause anemia and neurological issues. Measuring methylmalonic acid and homocysteine is a better screening method than serum B12 levels for early detection.

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Area of Science:

  • Internal Medicine
  • Neurology
  • Hematology

Background:

  • Vitamin B12 (cobalamin) deficiency is a frequent cause of macrocytic anemia.
  • It is linked to various neuropsychiatric conditions and emerging research suggests a role in hyperhomocysteinemia and atherosclerosis.
  • Current diagnostic methods, like serum B12 levels, can miss subclinical cases.

Purpose of the Study:

  • To highlight the limitations of standard vitamin B12 level measurements.
  • To introduce more sensitive biomarkers for early detection of vitamin B12 deficiency.
  • To evaluate the efficacy and safety of oral vitamin B12 supplementation.

Main Methods:

  • Comparison of serum vitamin B12 levels with methylmalonic acid and homocysteine levels for diagnosing deficiency.

Related Experiment Videos

  • Review of diagnostic approaches, including the shift from Schilling test to serologic antibody testing for pernicious anemia.
  • Analysis of studies examining oral vitamin B12 supplementation efficacy.

    • Main Results:

    • Serum methylmalonic acid and homocysteine levels increase early in vitamin B12 deficiency, offering a more sensitive screening method.
    • Approximately 50% of patients with subclinical vitamin B12 deficiency may have normal serum B12 levels.
    • Oral vitamin B12 supplementation is demonstrated as a safe and effective treatment, even in cases with impaired absorption like pernicious anemia.

    Conclusions:

    • Elevated methylmalonic acid and homocysteine are superior early indicators of vitamin B12 deficiency compared to serum B12 levels.
    • Oral vitamin B12 therapy is effective regardless of intrinsic factor presence or terminal ileum absorption site integrity.
    • This underscores the importance of considering alternative diagnostic markers and confirms the efficacy of oral supplementation.