Vitamin B12 Levels in Erythrocytes in Anaemia due to Folate Deficiency

In folate-deficiency anaemia erythrocyte vitamin B₁₂ levels were low before treatment began (mean = 80 ± 13.1 pg/ml). A rapid rise occurred during folic acid therapy (mean peak = 375 ± 207 pg/ml) and was followed by a slow fall towards normal (mean = 170 ± 54 pg/ml).