National Health and Nutrition Examination Survey

NHANES August 2021-August 2023

After suspension of NHANES field operations in March 2020 due to the COVID-19 pandemic, data collection began for a new 2-year cycle in August 2021. The August 2021-August 2023 nationally representative data files are based on an updated sample design and modified questionnaires, and examination procedures. Please see the links below for a brief overview and analytic guidance and the Plan and Operations Report for additional information on the collection and use of the data.

Data, Documentation, Codebooks

people_01 Demographics Data
food_01 Dietary Data
medical_03 Examination Data
lab_05 Laboratory Data
chat_01 Questionnaire Data
alert_02 Limited Access Data

Contents in Detail

clipboard_01 Questionnaire Instruments
lab_05 Laboratory Methods
book_03 Procedure Manuals
paper_02 Brochures and Consent Documents

Using the Data

paper_03 Brief Overview and Analytic Guidance
paper_01 Plan and Operations Report
paper_01 What We Eat in America, NHANES Dietary Data: Notice to Users
paper_01 Release Notes
atlas-light NCHS Data Briefs
chart_03 Survey Methods and Analytic Guidelines
map_01 Response Rates and Population Totals
clothes_01 NHANES Web Tutorial

Contents at a Glance

calendar_01 What's New
paper_02 Survey Content Brochure [PDF - 1.15 MB]
question_02 Frequently Asked Questions (FAQs)
stack_02 General Information about NHANES Documentation Files

Content source: CDC/National Center for Health Statistics