NHANES - National Health and Nutrition Examination Survey Homepage

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.

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Information for Health Professionals

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Notes

Advisory for Vitamin D Data

The purpose of this revised note is to inform users that serum 25-hydroxyvitamin D (25(OH)D) data from NHANES 2003-2004 and 2005-2006 have been adjusted for assay drifts and replaced previous 25(OH)D files. In addition, this note modifies the previous analytical note about issues that should be addressed when analyzing 25(OH)D data from NHANES 2000-2006 and NHANES III (1988-1994).

Read the Revised Analytical Note for NHANES 2000-2006 and NHANES III (1988-1994) 25-Hydroxyvitamin D Analysis [PDF - 32KB]

Advisory for Glycohemoglobin (A1c) Data

Glycohemoglobin cross-over study regression equation for 2005-2006 (GHB_D) and 2003-2004 (GHB_C) should not be used for trend analyses, and glycohemoglobin results for 2007-2008 (GHB_E) and 2009-2010 (GHB_F) have been withdrawn from release until further evaluation can be completed.

Read the Advisory for Glycohemoglobin (A1c) Data [PDF – 26 KB]

What's New

Publications

Prevalence of Obesity in the United States, 2009–2010

New

Hepatitis E (HEPE_F 2009-2010)
Plasma Fasting Glucose and Insulin (GLU_F 2009-2010)
Two-hour Oral Glucose Tolerance Test (OGTT_F 2009-2010)
Alcohol Use (ALQ_F 2009-2010)
Alcohol Use Youth (ALQY_F 2009-2010)
Bowel Health (BHQ_F 2009-2010)
Early Childhood (ECQ_F 2009-2010)
Kidney Conditions - Urology (KIQ_U_F 2009-2010)
Osteoporosis (OSQ_F 2009-2010)
Sleep Disorders (SLQ_F 2009-2010)
Weight History (WHQMEC_F 2009-2010)

Limited Access Documentation

Alcohol Use Youth (RDC) (ALQY_F_R 2009-2010)

Updated

Complete Blood Count with 5-Part Differential in Whole Blood (CBC_F 2009-2010)
Platelet count and RBC data have been added to CBC_F.
PHPYPA Urinary Phthalates (PHPYPA 1999-2000)
Urinary Phthalates, Phytoestrogens and PAHs (PHPYPA_B 2001-2002)
Urinary Phthalates (L24PH_C 2003-2004)
Urinary Phthalates (PHTHTE_D 2005-2006)
Urinary Phthalates (PHTHTE_E 2007-2008)
NCHS recently learned that analytical standards used since 1999 and used for several metabolites were of insufficient purity. After further investigation, it was determined that a correction factor needs to be applied to each value for the 5 metabolites. These metabolites and the specific correction factor for each are as follows: Mono-ethyl phthalate (URXMEP), 0.66; Mono-benzyl phthalate (URXMZP), 0.72; Mono-n-octyl phthalate (URXMOP), 1.68; Mono-isononyl phthalate (URXMNP), 1.54; and Mono-cyclohexyl phthalate (URXMCP), 2.01. The correction factor should be applied to each analyte for NHANES survey periods 1999-2000, 2001-2002, 2003-2004, 2005-2006, and 2007-2008 results.
Urinary Priority Pesticides (Non-Persistent Pesticide Metabolites) (LAB26PP 1999-2000)
Urinary Priority Pesticides (Non-Persistent Pesticide Metabolites), (L26PP_B 2001-2002)
The pentachlorophenol (URXPCP) and 2,4-dichlorophenol (URXDCB) results for the 2 survey periods (1999-2000 and 2001-2002) were affected by an unacceptable calibration bias and these results are withdrawn. A similar calibration bias resulted in withdrawal of several chemical results for the 2 survey periods and described in documentation notes for the Urinary Priority Pesticides and Organophosphate Pesticides files (Lab26PP, L26PP_B).