Lab Viewer is a web-based application that allows users to view laboratory data stored in the Clinical Trials Object Data System (CTODS) Lab Domain database. Lab Viewer is one of the core applications of the caBIG® Clinical Trials Suite. Lab Viewer can send and receive clinical data (via the caBIG® Integration Hub) from existing laboratory information management systems (LIMS), patient registries, adverse event systems, electronic patient calendars, electronic case report forms, and other clinical data collection systems. Data may be stored in the CTODS Lab Domain database or sent to other caBIG® Clinical Trials Suite components via the caBIG® Integration Hub. In addition, Lab Viewer v2.0 has been integrated with the Clinical Trials Reporting Program (CTRP) (COPPA). Users of Lab Viewer may browse for laboratory activity by Medical Record Number (MRN), Study, and date range. Lab Viewer also allows users to select and send laboratory and other clinical data (as an HL7 v3 formatted message) to clinical data collection systems and automatically flag lab values that are out of normal range.