National Health and Nutrition Examination Survey

Your Privacy

Your privacy is a top priority for the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention (CDC), the survey’s managing agency. Your confidential participation is incredibly valuable.

NCHS is bound by law to protect your data, following strict privacy standards that have protected every NHANES participant since 1960.

  • Your name will not be linked with your questionnaire answers and exam results.  You will be given a unique participant ID for the survey.
  • Your answers are voluntary and confidential.
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  • NHANES databases are password protected and encrypted and can only be viewed by appropriate personnel.
  • NCHS combines your protected data with information from thousands of other survey participants. Combined data are then carefully reviewed to ensure that no information can be linked back to you or any other person or family.

More information on Participant Privacy can be found in our Confidentiality Brochure [PDF – 94 KB].

Contact NHANES

If you have questions about NHANES, please call 1-800-232-4636.

For more information on NHANES visit the National Health and Nutrition Examination Survey homepage.