Variable and Dataset Descriptor Length in FDA Study Data Submission
FDA’s June 2026 conformance guide sets maximum descriptor lengths of 8 characters for variable names and 40 characters for variable descriptive labels and dataset labels in the specified study-data exchange context. These numeric limits are current FDA technical-conformance specifications and should be rechecked when the guide or supported exchange format changes.
ReviewedEvidence1 sourceSectionWriting & Style
Quick answer
Keep variable names and descriptive or dataset labels within the current FDA maximum lengths documented for submitted study-data elements.
Key details
Core IssueFDA’s June 2026 conformance guide sets maximum descriptor lengths of 8 characters for variable names and 40 characters for variable descriptive labels and dataset labels in the specified study-data exchange context.
Registerscholarly, professional, or research/report writing
Important caveats
Scope Boundary
These numeric limits are current FDA technical-conformance specifications and should be rechecked when the guide or supported exchange format changes.
Further guidance
Content
Apply the current supported standard and submission-format rules alongside these length limits; descriptor limits do not replace controlled terminology or dataset-model requirements.
Purpose
Keep variable names and descriptive or dataset labels within the current FDA maximum lengths documented for submitted study-data elements.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
FDA’s June 2026 Study Data Technical Conformance Guide gives specific conventions for variable descriptive labels and dataset labels, including avoiding certain unbalanced punctuation that can interfere with processing. These requirements are current FDA technical-conformance guidance for electronic study-data submissions and should be rechecked when FDA guidance, supported standards, or eCTD specifications change.
FDA’s June 2026 conformance guide requires variable and dataset names to follow the applicable standards-development-organization technical specifications and gives SAS naming-option guidance for submitted datasets. These requirements are current FDA technical-conformance guidance for electronic study-data submissions and should be rechecked when FDA guidance, supported standards, or eCTD specifications change.
FDA’s June 2026 conformance guide recommends sizing character-data columns to the maximum variable length used across study datasets, with a separate individual-dataset rule for SUPPQUAL datasets. This is current FDA technical-conformance guidance for study-data files; exact implementation must still follow the applicable supported data standard and submission format.
FDA’s June 2026 conformance guide specifies .xml for XML files used in the covered study-data submission context and states that define.xml should not be compressed.
FDA’s June 2026 conformance guide states that SAS CPORT transport files cannot be processed, reviewed, or archived by FDA in the covered study-data submission workflow.
