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USDV4
Uniform Data Set version 4
UDSv4 - Template
United States
Reference ID
USDv4
Producer(s)
National Alzheimer’s Coordinating Center (NACC) and the NIA-funded ADRC network
Collections
Clinical Trial
Metadata
DDI/XML
JSON
Created on
Jul 02, 2026
Last modified
Jul 07, 2026
Page views
11399
Study Description
Data Dictionary
Data files
UDSv4TemplateForXMLD_2026-04-14_0731.REDCap.xml
Variable Groups
Form Header
Custom Instrument
A1 Participant Demographics
A1a Social Determinants of Health
A2 Co-participant demographics
A3 Participant Family History
A4 Participant Medications
A4a ADRD Specific Treatments
A5-D2: Participant Health History/Clinician-assessed Medical Conditions
B1 Vital Signs and Anthropometrics
B3 Unified Parkinson's Disease Rating Scale (UPDRS) - Motor Exam
B4 CDR Dementia Staging Instrument
B5 Neuropsychiatric Inventory Questionnaire (NPIQ)
B6 Geriatric Depression Scale
B7 Functional Assessment Scale (FAS)
B8 Neurological Examination Findings
B9 Clinician Judgment Of Symptoms
C2/C2T Neuropsychological Battery Scores
D1a Clinical Syndrome
D1b Etiological Diagnosis and Biomarker Support
Variable Groups
Variable group: Form Header
Variables
18
adcid
ADCID
form_header_complete
Complete?
formver
Form version number
loc_5_yrs_ago
5 years ago
loc_66_choice_instr
Previous visit choice 66 instructional text
loc_666_choice_instr
Previous visit choice 666 instructional text
loc_6666_choice_instr
Previous visit choice 6666 instructional text
loc_777_choice_instr
Previous visit choice 777 instructional text
loc_currentyr
Current year
loc_dssub
Will you complete a Down Syndrome Module with this UDS visit?
loc_max_birth_yr
Maximum birth year
loc_packet_footer
Packet name in footer
loc_packet_header
Packet name in header
loc_packet_rel_dt
Packet release date
packet
Packet Code
ptid
PTID
visitdate
Visit date Use the date that the UDS visit began (typically A1 form date).
visitnum
ADRC Visit Number
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