Vitamin B12 Test: References

Johnson L. Vitamin B12. Merck Manual Professional Edition. http://www.merckmanuals.com/professional/nutritional_disorders/vitamin_deficiency_dependency_and_toxicity/vitamin_b12.html. Updated September 2016. Accessed February 2017.

Vitamin B12 and folate. Lab Tests OnLine. http://labtestsonline.org/understanding/analytes/vitamin-b12. Updated October 30, 2015. Accessed March 2017.