National Health and Nutrition Examination Survey

What to Expect and Information Collected

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Your household will be sent one or more letters inviting you to participate in NHANES.

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Complete a brief online questionnaire about the people living in your home to see if anyone is eligible to participate. This can also be done over the telephone.

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Anyone eligible will be contacted by an NHANES representative to set up a telephone health interview at a convenient time.  During this phone call, you will be asked questions about your health and any health problems, like diabetes or asthma. Anything you say during this interview is confidential.

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At the end of the interview, we will schedule your visit to the NHANES Mobile Exam Center.  Your health exam is specific to you – based on your age and gender.  Some of the health exams participants receive are

  • Height, weight, and other body measures
  • Blood pressure reading
  • Body composition scan
  • Balance test
  • Liver function scan

While you are at the exam center, we will schedule a follow-up telephone call to ask about the foods you eat.

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You will get results from your health exam, including laboratory results from urine and blood samples, that you can share with your health care provider. Examples of some tests include

  • Cholesterol
  • Glucose
  • Nutrition status, including tests for anemia and Vitamin D
  • Kidney function tests
  • Inherited hemoglobin traits, such as sickle cell
  • Infectious diseases
  • Exposure to environmental chemicals
  • Exposure to environmental metals

Contact NHANES

If you have questions about NHANES, talk to our study representatives toll-free at 1-855-958-0631.

Hours of Operation: Monday-Friday, 9:00 AM-5:00 PM EST.

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

Page last reviewed: July 22, 2021