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National Health and Nutrition Examination Survey

The National Health and Nutrition Examination Survey (NHANES) is a program of studies designed to assess the health and nutritional status of adults and children in the United States. The survey is unique in that it combines interviews and physical examinations.

Selected Participants

Have you been selected to take part in the National Health and Nutrition Examination Survey?

Information for Health Professionals

Learn about participant involvement and benefits with the National Health and Nutrition Examination Survey

NHANES National Youth Fitness Survey

The NHANES National Youth Fitness Survey (NNYFS) was a one year survey conducted in 2012. The NNYFS collected nationally representative data on physical activity and fitness levels of children and adolescents in the United States through interviews and fitness tests. On September 30, 2013, the first wave of this data was released. To review documentation and download datasets, go to the NNYFS Data and Documentation page.

What's New

Data Release
Updated Data

The Physical Functioning (PFQ_H) file has been updated to include participants 3 to 4 years of age and an additional question (PFQ033) on use of special equipment.

The t,t-Muconic acid (URXMUCA) data were withdrawn from the Urinary Volatile Organic Compounds datasets (UVOC_G and UVOCS_G) in the NHANES 2011-2012 cycle, due to an observed issue with the internal standard transition used for quantitation. It was determined that the internal standard quantitation scheme used was not consistent during the 2011-2012 cycle, and the data could not be recalculated, even after the issue was identified and corrected. A detailed analytical note has been included in the dataset. The documentation file and laboratory procedure manual have been updated to reflect the withdrawal of all URXMUCA data.