Serum vitamin B12, folate, and iron levels in recurrent aphthous ulceration.

Hematologic deficiencies have previously been described in some cases of recurrent aphthous ulceration (RAU). Ninety patients with RAU and twenty-three healthy control subjects were evaluated by complete blood count, serum iron, and total iron-binding capacity, serum vitamin B12, and serum or red blood cell folate. Only three of ninety RAU patients proved to have abnormalities. There were no statistically significant differences between the patient and control populations, and no one in either group had abnormal serum vitamin B12 or serum or RBC folate assays. None of the patients or controls gave a history or symptoms suggestive of iron-deficiency or megaloblastic anemia, and all were without gastrointestinal complaints. These results suggest that hematologic tests other than a complete blood count are not routinely indicated for patients with RAU.