Maternal and neonatal vitamin B12 deficiency detected through expanded newborn screening--United States, 2003-2007.

The incidence of neonatal vitamin B12 (cobalamin) deficiency because of maternal deficiency was determined by surveying state newborn screening programs. Thirty-two infants with nutritional vitamin B12 deficiency were identified (0.88/100,000 newborns).

Storage and use of residual dried blood spots from state newborn screening programs.

Objectives: To provide current data for policy discussions and to assess future needs among newborn screening programs regarding the storage and use of residual dried blood spots (DBS) in the United States.

Study Design: An electronic questionnaire was administered to U.S.