Vitamine B12 deficiency in children: a diagnostic challenge

Area of Science:

• Pediatric Hematology
• Nutritional Science
• Clinical Diagnostics

Background:

• Vitamin B12 (cobalamin) is crucial for DNA synthesis, red blood cell formation (hematopoiesis), and nerve sheath maintenance (myelinization).
• Vitamin B12 deficiency can lead to serious conditions like megaloblastic anemia, neurological deficits, and pancytopenia, but may also be asymptomatic.

Observation:

• This report details six pediatric cases of vitamin B12 deficiency with diverse causes and presentations, from subtle to overt symptoms.
• Diagnosing vitamin B12 deficiency is complex due to inconsistent reference ranges for vitamin B12 and related markers (folate, holotranscobalamin, MMA, homocysteine).
• The sensitivity and specificity of serum vitamin B12 analysis present diagnostic limitations.

Findings:

• All six pediatric patients received parenteral vitamin B12 for treatment.
• Evidence suggests high-dose oral vitamin B12 therapy may be as effective as intramuscular administration, even in pediatric populations.

Implications:

• Highlights the diagnostic challenges in pediatric vitamin B12 deficiency and the need for careful evaluation.
• Suggests that parenteral vitamin B12 is an effective treatment, with oral therapy emerging as a viable alternative.
• Emphasizes the importance of considering vitamin B12 deficiency in pediatric patients presenting with a wide spectrum of symptoms, including asymptomatic cases.