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Glossary of Common Site Terms

This glossary will help you understand words and phrases frequently used on ClinicalTrials.gov. Many of these words are also used by clinical researchers and others in the same or a similar manner. But the definitions below are provided to explain content on ClinicalTrials.gov only.

For help with medical terms, see the MedlinePlus® Medical Dictionary.

Study record managers should refer to the Protocol Registration Data Element Definitions, Expanded Access Data Element Definitions, and Results Data Element Definitions for help with the data items required to register a study and submit results using the ClinicalTrials.gov Protocol Registration and Results System.

This page last reviewed in December 2017