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[Approaches to vitamin B12 deficiency]
Henk Russcher1, Sandra G Heil, Lennert Slobbe
1Erasmus Medisch Centrum, afd. Klinische Chemie, Rotterdam, the Netherlands. h.russcher@erasmusmc.nl
Nederlands Tijdschrift Voor Geneeskunde
|January 6, 2012
Summary
Diagnosing vitamin B12 deficiency can be challenging. Measuring active vitamin B12 (holotranscobalamin II) offers a more accurate approach for identifying deficiency states.
Area of Science:
- Hematology
- Clinical Chemistry
- Nutritional Science
Background:
- Persistent iron deficiency anemia can mask other deficiencies.
- Traditional vitamin B12 testing may not detect early or atypical deficiency states.
- Gastric surgery and diabetes complications can impact vitamin B12 absorption.
Observation:
- A vegetarian patient presented with microcytic anemia and normal total vitamin B12, but low active vitamin B12.
- An elderly patient with gastric surgery and diabetes showed low total vitamin B12 with elevated methylmalonic acid and homocysteine.
- Red blood cell distribution width indicated coexisting vitamin B12 deficiency in the first patient.
Findings:
- Total vitamin B12 concentration alone has insufficient diagnostic accuracy.
- Active vitamin B12 (holotranscobalamin II) measurement can identify subclinical deficiency.
- Elevated methylmalonic acid and homocysteine suggest functional vitamin B12 deficiency.
Implications:
- A new diagnostic approach for vitamin B12 deficiency is proposed.
- Early recognition of vitamin B12 deficiency is crucial for preventing neurological complications.
- Holotranscobalamin II testing improves the diagnosis of vitamin B12 deficiency in complex cases.
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