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Welcome to the National Health and Nutrition Examination Survey (NHANES) Longitudinal Study.

The NHANES Longitudinal Study is conducted by the National Center for Health Statistics (NCHS), part of the Centers for Disease Control and Prevention (CDC). This study will help us understand how health changes over time for people in the United States.

Thank you for responding to our mail invitation of the study. Please use the user ID and password we mailed you earlier to log in. If you need any assistance, please call the toll free number at 1-855-261-3589 (9 am - 4:30 pm, ET).

For more detailed information about the study, please go to or call us at 1-800-452-6115, Monday-Friday, 7:30 am – 4:30 pm ET.