Background: Existing information about the prevalence of pernicious anemia is largely
based on older surveys that favored florid manifestations, tended to be retrospective
analyses of previously diagnosed disease, and usually studied homogeneous European
populations. The lack of current data in the United States has, among other things,
hampered discussions of the proposal to increase folate intake by the general population.
Objective: To estimate the prevalence of undiagnosed and untreated pernicious anemia …