Exploratory common data element

An exploratory common data element (CDE) requires further validation, but may fill current gaps in the CDEs and/or substitute for an existing CDE once validation is complete. Such data elements show great promise, but require further validation before they are ready for prime-time use in clinical research studies. They are reasonable to use with the understanding that limited study has been done in the target group.

Sourced From
National Institute of Neurological Disorder and Stroke (NINDS): Classifications of Data Elements for a Particular Disease