NCHS

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

Publications

Anthropometric Reference Data for Children and Adults: United States, 2011–2014 (8/3/2016)

Data Release

Fluoride - Plasma (FLDEP_H 2013-2014)
Fluoride - Water (FLDEW_H 2013-2014)
Oral Health (OHQ_H 2013-2014)
Oral Health - Dentition (OHXDEN_H 2013-2014)
Oral Health - Periodontal (OHXPER_H 2013-2014)
Oral Health - Recommendation of Care (OHXREF_H 2013-2014)

Data Release - Limited Access Data

Albumin & Creatinine - Urine (ALCR_G_R 2011)
Electrolytes - MEC Urine Collection - Surplus (SSLT_H_R 2014)

Updated Data

Data documentation and/or method documents have been updated for the files below, as indicated. No changes or corrections have been made to the data.

The insulin was performed 2005-2009 using the Mercodia ELISA assay and was switched in late 2009 to a Roche chemiluminescent immunoassay performed on the Elecsys 2010 analyzer. A crossover study was performed between the two methods. To trend 1999-2012 serum insulin, a "forward" fractional polynomial regression was added to the analytic note to derive 2011-2012 Roche-equivalent insulin values from the measured Mercodia insulin values from NHANES 2005-2008. See the analytic note on "change in methods for serum insulin."

Plasma Fasting Glucose and Insulin (Subsample) (GLU_G 2011-2012)

There was a change in late 2009 from the Mercodia to the Elecsys insulin method. For 2009-2010, a new Mercodia ELISA insulin method file was added in addition to the Elecsys 2010 insulin method file. See the lab methods Insulin-Mercodia ELISA and Insulin-Elecsys 2010 Immunoassay.

Plasma Fasting Glucose and Insulin (Subsample) (GLU_F 2009-2010)

The insulin was performed 2003-2004 using the Tosoh immunoenzymometric assay and was switched in 2005-2006 to a Mercodia ELISA assay. A crossover study was performed between the two methods. To trend 2003-2006 serum insulin, a "forward" linear regression was added to the analytic note to derive Mercodia-equivalent insulin values for NHANES 2005-2006 from measured Tosoh insulin values measured in 2003-2004. See the analytic note on "Insulin regression equation to compare 2005-2006 data and 2003-2004 data."

Plasma Fasting Glucose & Insulin (Subsample) (GLU_D 2005-2006)

The insulin was performed 1999-2002 using the Pharmacia RIA assay and was switched in 2003-2004 to a Tosoh immunoenzymometric assay. A crossover study was performed between the two methods. To trend 1999-2004 serum insulin, a "backward" linear regression was added to the analytic note to derive Pharmacia-equivalent insulin values for NHANES 1999-2002 from measured Tosoh insulin values measured in 2003-2004. See the analytic note on "Comparison of NHANES 2003-2004 to NHANES 1999-2002 Insulin Values.".