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The development of Electronic Health Record (EHR) systems containing valuable clinical information is an opportunity not only for health care but also for clinical research. Clinical Trial (CT) management systems would improve their processes by accessing this EHR data in a straightforward way.
Nevertheless, there are still many problems to be solved in order to facilitate the reuse of information, including the lack of common formats for the representation of data, or a limited definition of the meaning of that data. The use of standards and clinical terminologies, together with a clear definition of clinical information models becomes essential in order to enable the semantic interoperability of EHR and clinical trials by means of a standardized definition of the data to be exchanged.