The clinical research coordinator serves as the operational backbone of clinical trial conduct at the site level, managing the complex logistics and detailed requirements that determine whether a trial succeeds or fails. Working under the investigator's supervision, the CRC coordinates participant recruitment and scheduling, administers study procedures, collects and enters data, maintains regulatory documentation, and serves as the primary point of contact for sponsors and monitors. This multifaceted role requires exceptional organizational skills, attention to detail, and the ability to work effectively with diverse stakeholders.

CRC responsibilities span the entire participant journey through a clinical trial. Before enrollment, coordinators screen potential participants against protocol eligibility criteria, coordinate the informed consent process, and schedule baseline assessments. During participant follow-up, they ensure that study visits occur within protocol-specified windows, that all required assessments are completed, that adverse events are identified and reported, and that participants remain engaged and informed about the study. At study conclusion, coordinators manage closeout activities and ensure that documentation is complete and properly archived.

The relationship between the CRC and the investigator is collaborative and complementary. While the investigator retains responsibility for medical decisions and participant safety, the CRC handles the operational implementation that makes those decisions effective. Strong CRCs anticipate problems before they occur, maintain meticulous documentation, and serve as advocates for both participant welfare and data quality. The position has become increasingly professionalized, with certification programs and professional organizations supporting career development.