References
- Türkyılmaz K, Oner V, Türkyılmaz AK, Kırbaş A, Kırbaş S, Sekeryapan B. Evaluation of peripapillary retinal nerve fiber layer thickness in patients with vitamin B12 deficiency using spectral domain optical coherence tomography. Curr Eye Res 2013;38:680–684
- Carmel R. Mild transcobalamin I (haptocorrin) deficiency and low serum cobalamin concentrations. Clin Chem 2003;49:1367–1374
- Hvas AM, Nexo E. Diagnosis and treatment of vitamin B12 deficiency – an update. Haematologica 2006;91:1506–1512
- Carmel R. How I treat cobalamin (vitamin B12) deficiency. Blood 2008;112:2214–2221
- Carmel R. Cobalamin, the stomach, and aging. Am J Clin Nutr 1997;66:750–759
- Lindenbaum J, Rosenberg IH, Wilson PWF, Stabler SP, Allen RH. Prevalence of cobalamin deficiency in the Framingham elderly population. Am J Clin Nutr 1994;60:2–11
- Carmel R, Green R, Jacobsen DW, Rasmussen K, Florea M, Azen C. Serum cobalamin, homocysteine and methylmalonic acid concentrations in a multiethnic elderly population: ethnic and sex differences in cobalamin and metabolite abnormalities. Am J Clin Nutr 1999;70:904–910
- Bailey RL, Carmel R, Green R, Pfeiffer CM, Cogswell ME, Osterloh JD, et al. Monitoring of vitamin B-12 nutritional status in the United States by using plasma methylmalonic acid and serum vitamin B-12. Am J Clin Nutr 2011;94:552–561
- Carmel R. Is testing for clinical cobalamin deficiency truly unreliable? Blood 2005;106:1136–1137
- Solomon LR. Cobalamin-responsive disorders in the ambulatory care setting: unreliability of cobalamin, methylmalonic acid, and homocysteine testing. Blood 2005;105:978–985
- Devalia V. Diagnosing vitamin B-12 deficiency on the basis of serum B-12 assay. BMJ 2006;333:385–386
- Hamilton MS, Blackmore S, Lee A. Possible cause of false normal B-12 assays. BMJ 2006;333:654–655
- Yang DT, Cook RJ. Spurious elevations of vitamin B12 with pernicious anemia. N Engl J Med 2012;366:1742–1743