National Report on Human Exposure to Environmental Chemicals
The National Report on Human Exposure to Environmental Chemicals is a series of ongoing assessments of the U.S. population's exposure to environmental chemicals by measuring chemicals in a person's blood or urine. The Environmental Health Laboratory within CDC's National Center for Environmental Health (NCEH) has produced four of these reports since 2001. The Fourth Report includes findings from national samples for 1999-2000, 2001-02, and 2003-04. Updated tables to the report provide data for 2005-06.
Blood and urine samples were collected from participants in the National Health and Nutrition Examination Survey (NHANES), a representative sample of the U.S. civilian non-institutionalized population. Participants in NHANES are asked about their diet, exercise and other health habits, and their medical histories. They also take medical tests and provide blood and urine samples. Scientists at the NCEH laboratory measure levels of different chemicals in these samples, such as lead and pesticides.
Each two-year NHANES sample includes about 2,400 persons.