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Nivel de vitamina B12 - Results

Valores normales:

Los valores normales son de 200 a 900 pg/ml (picogramos por mililitro).

Los rangos de los valores normales pueden variar ligeramente entre diferentes laboratorios. Hable con el médico acerca del significado de los resultados específicos de su examen.

Los ejemplos anteriores muestran las mediciones comunes para los resultados de estas pruebas. Algunos laboratorios usan diferentes medidas o podrían evaluar diferentes muestras.

Significado de los resultados anormales:

Los valores de menos de 200 pg/mL son un signo de deficiencia de vitamina B12, y es probable que las personas con dicha deficiencia tengan o desarrollen síntomas. Los adultos mayores con los niveles de la vitamina B12 entre 200 y 500 pp/mL pueden también tener síntomas.

Las causas de deficiencia de B12 son, entre otras:

  • Insuficiencia de vitamina B12 en la alimentación (poco frecuente a excepción de una dieta vegetariana estricta)
  • Enfermedades que causan malabsorción como, por ejemplo, celiaquía y enfermedad de Crohn
  • Carencia del factor intrínseco
  • Producción de calor por encima de lo normal (por ejemplo, con hipertiroidismo)
  • Embarazo

El aumento en los niveles de vitamina B12 es poco común y es normal que su exceso se excrete en la orina.

Las afecciones que pueden incrementar los niveles de vitamina B12 abarcan:

  • Reviewed last on: 3/21/2010
  • Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine; James R. Mason, MD, Oncologist, Director, Blood and Marrow Transplantation Program and Stem Cell Processing Lab, Scripps Clinic, Torrey Pines, California.

Referencias

Mason JB. Vitamins, Trace Minerals, and Other Micronutrients. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 237.

Kumar N. Neurologic presentations of nutritional deficiencies. Neurol Clin. 2010 Feb;28(1):107-70.

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