Murphy, MM, Molloy, A, Ueland, PM et al. Longitudinal study of the effect of pregnancy on maternal and fetal cobalamin status in healthy women and their offspring. The Journal of Nutrition 2007; 137: 1863–1866.CrossRefGoogle ScholarPubMed

Vanderjagt, D, Ujah, I, Ikeh, EI et al. Assessment of the vitamin B12 status of pregnant women in Nigeria using plasma holotranscobalamin. ISRN Obstetrics and Gynecology 2011: 365894.Google Scholar

Green, R. Physiology, dietary sources, and requirements. Encyclopedia of Human Nutrition, 3rd edn, Vol 4. USA: Elsevier; 2013: 351–356.Google Scholar

Sobczyńska-Malefora, A, Gorska, R, Pelisser, M et al. An audit of holotranscobalamin (“Active” B12) and methylmalonic acid assays for the assessment of vitamin B12 status: Application in a mixed patient population. Clinical Biochemistry 2014; 47: 82–86.Google Scholar

Stabler, S. Vitamin B₁₂ deficiency. New England Journal of Medicine 2013; 368:149–160.Google Scholar

Reynolds, E. Vitamin B12, folic acid, and the nervous system. The Lancet Neurology 2006; 5(11): 949–960.Google Scholar

Gauchan, D, Joshi, N, Singh Gill, A, et al. Does an elevated serum vitamin B₁₂ level mask actual vitamin B₁₂ deficiency in myeloproliferative disorders? Clinical Lymphoma, Myeloma & Leukemia 2012; 12(4): 269–273.CrossRefGoogle ScholarPubMed

Harmening, D. Clinical Hematology and Fundamentals of Hemostasis, 4th edn, Vol 7. USA: The Taber’s publisher; 2002: 112–119.Google Scholar

Provan, D, Singer, C, Baglin, T, Dokal, I. Oxford Handbook of Clinical Hematology, 3rd edn, Vol 2. Oxford: Oxford University Press; 2009: 46–47.CrossRefGoogle Scholar

Gröber, U, Kisters, K, Schmidt, J. Neuroenhancement with vitamin B₁₂ underestimated neurological significance. Nutrients 2013; 5: 5031–5045.CrossRefGoogle ScholarPubMed

Kaushansky, K, Lichtman, M, Beutler, E et al. Williams Hematology, 8th edn, Vol 41. USA: McGraw Hill Medical; 2008: 538–545.Google Scholar

Devalia, V, Hamilton, M, Molloy, A. Guidelines for the diagnosis and treatment of cobalamin and folate disorders. British Journal of Hematology 2014; 166: 496–513.Google Scholar

Quadros, E. Advances in the understanding of cobalamin assimilation and metabolism. British Journal of Hematology 2010; 148: 195–204.CrossRefGoogle ScholarPubMed

Black, M. Effects of vitamin B12 and folate deficiency on brain development in children. Food and Nutrition Bulletin 2008; 29(2 Suppl): S126–S131.CrossRefGoogle ScholarPubMed

Carmel, R. How I treat cobalamin (vitamin B₁₂) deficiency. Blood 2008; 112: 2214–2221.Google Scholar

Lindenbaum, J, Healton, E, Savage, D. Neuropsychiatric disorders caused by cobalamin deficiency in the absence of anemia or macrocytosis. New England Journal of Medicine 1988; 318: 1720–1728.Google Scholar

Solomon, L. Disorders of cobalamin (Vitamin B₁₂) metabolism: Emerging concepts in pathophysiology, diagnosis and treatment. Blood Reviews 2007; 21: 113–130.Google Scholar

Clarke, R, Sherliker, P, Hin, H. Detection of vitamin B12 deficiency in older people by measuring vitamin B12 or the active fraction of vitamin B12, holotranscobalamin. Clinical Chemistry 2007; 53(5); 963–970.CrossRefGoogle ScholarPubMed

Valente, E, Scott, J, Ueland, P et al. Diagnostic accuracy of holotranscobalamin, methylmalonic acid, serum cobalamin, and other indicators of tissue vitamin B12 status in the elderly. Clinical Chemistry 2011; 57(6): 856–863.CrossRefGoogle ScholarPubMed

Sobczyńska-Malefora, A, Harrington, D, Voong, K et al. Plasma and red cell reference intervals of 5-methyltetrahydrofolate of healthy adults in whom biochemical functional deficiencies of folate and vitamin B12 had been excluded. Advances in Hematology 2014: 465623. doi:10.1155/2014/465623.CrossRefGoogle Scholar

Clinical Knowledge Summaries. Anemia – B12 and folate. https://cks.nice.org.uk/anaemia-b12-and-folate-deficiency#!topicsummaryGoogle Scholar

British National Formulary (BNF). http://www.medicinescomplete.com/mc/bnf/current/PHP5867-drugs-used-in-megaloblastic-anemias.htmGoogle Scholar

Yakoob, M, Bhutta, Z. Effect of routine iron supplementation with or without folic acid on anemia during pregnancy. BMC Public Health 2011; 11(Suppl 3): S21.Google Scholar

Short, R. UK government consults public on compulsory folate fortification. BMJ 2006; 332(7546): 873.Google Scholar

Rain, J, Blot, I, Tcherina, G. Folic acid deficiency in developing nations. In Cooper, BA et al. (eds) Folates and Cobalamins, Bertin, Heidelberg: spinger-verlag; 1989: 171–177.CrossRefGoogle Scholar

De Benoist, B. Conclusions of a WHO Technical Consultation on folate and vitamin B12 deficiencies. Food and Nutrition Bulletin 2008; 29(2): S238–244.CrossRefGoogle ScholarPubMed

Greenberg, J, Bell, S, Guan, Y et al. Folic acid supplementation and pregnancy: more than just neural tube defect prevention. Reviews in Obstetrics and Gynecology 2011; 4(2): 52–59.Google Scholar

Ueland, PM, Vollset, SE. Homocysteine and folate in pregnancy. Clinical Chemistry 2004; 50(8): 1293–1294.Google Scholar

Fuller-Deets, M, Dingwall, R. The Ethical Implications of Options for Improving the Folate Intake of Women of Reproductive Age. Food Standards Agency report produced by the Institute for Science and Society, University of Nottingham. 2007; 17: 1–56.Google Scholar

Wilson, RD, Johnson, JA, Wyatt, P et al. Genetics Committee of the Society of Obstetricians and Gynecologists of Canada and The Motherrisk Program. Pre-conceptional vitamin/folic acid supplementation 2007: the use of folic acid in combination with a multivitamin supplement for the prevention of neural tube defects and other congenital anomalies. Journal of Obstetrics and Gynaecology Canada 2007; 29: 1003–1026.Google Scholar

Castillo-Lancellotti, C, Tur, J, Uauy, R. Impact of folic acid fortification of flour on neural tube defects: a systematic review. Public Health Nutrition 2013; 16(5): 901–911.CrossRefGoogle ScholarPubMed