Which term matches: A data item whose codes, definitions, and coding instructions are shared among registry organizations?

• A. Data set
• B. Standard data item
• C. Data dictionary
• D. Interoperability

Answer: (B)

A data item whose codes, definitions, and coding instructions are shared across registry organizations is a standard data item. This shared standardization means every registry uses the same predefined meaning and coding rules for that item, so data collected in different places can be compared and combined without ambiguity. This is what enables reliable data pooling and multicenter analysis. A data set is simply a collection of items to be collected, not necessarily standardized across organizations. A data dictionary is the repository of metadata—definitions and allowed values for data elements—but the emphasis here is on the item itself being standardized across registries. Interoperability refers to the ability of systems to exchange and use data, not to the data item’s shared definitions.