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Related Experiment Videos

How to diagnose cobalamin deficiency

E Nexø1, M Hansen, K Rasmussen

  • 1Dept Clinical Biochemistry, University Hospital of Aarhus, Denmark.

Scandinavian Journal of Clinical and Laboratory Investigation. Supplementum
|January 1, 1994
PubMed
Summary

Cobalamin deficiency can cause anemia and neuropsychiatric issues. Assays for P-cobalamins and P-methylmalonate can screen for this deficiency, guiding diagnosis and treatment.

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Area of Science:

  • Biochemistry
  • Clinical Medicine
  • Nutritional Science

Background:

  • Cobalamin (vitamin B12) deficiency is a significant concern, potentially leading to unexplained anemia and neuropsychiatric symptoms.
  • Certain populations, including the elderly, vegetarians, HIV-infected individuals, and those with gastrointestinal diseases or autoimmune conditions, are at higher risk.
  • Early detection is crucial for preventing irreversible neurological damage and managing associated health complications.

Observation:

  • Diagnostic assays include measuring serum cobalamins (P-cobalamins) and metabolites like P-methylmalonate and P-homocysteine.
  • Low P-cobalamin levels or specific fractions (P-TC cobalamins) can indicate latent deficiency.
  • Elevated P-methylmalonate, which decreases after cobalamin administration, signifies overt metabolic deficiency, while P-homocysteine is a less specific marker.

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Findings:

  • Serum cobalamin or P-methylmalonate assays are recommended as initial screening tests for cobalamin deficiency.
  • Further investigations are warranted only when initial screening results are inconclusive in the context of the patient's clinical presentation.
  • Cobalamin absorption tests, such as the Schilling test, are considered to have limited clinical utility.

Implications:

  • Prompt diagnosis and lifelong treatment are essential once cobalamin deficiency is confirmed.
  • Identifying the underlying cause of the deficiency is critical for effective long-term management.
  • Gastric atrophy, a potential cause, can be inferred from elevated P-gastrin or decreased P-pepsinogen A, and confirmed via endoscopy.