Substance Use Start Date Time

The date and time substance usage began. (NCI Thesaurus)

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Substance Use Sponsor Defined Identifier

One or more sponsor defined characters used to name substance usage data.

Substance Use Sequence

An identifier that describes the relative position of substance use data within a series.

Substance Use Route of Administration

The method a substance was introduced to a subject.

Substance Use Reported Name

The literal identifier of the substance in use.

Substance Use Reason Not Collected

The rationale why substance use data was not obtained.

Substance Use Occurrence

An indication or description regarding an episode of substance usage.