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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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