Abstract: A computer-implemented method of tracking patient data in a clinical trial is provided. The clinical trial has one or more investigative sites which perform patient screening and enrollment for the clinical trial, one or more diagnostic sites which perform analysis on one or more patient diagnostic tests ordered by an investigative site and generate analysis results, and a centralized data center in electronic communication with the one or more investigative sites and the one or more diagnostic sites. Each investigative site is provided with a user interface display screen for allowing a user at the investigative site to enter data regarding patients who have been screened for the clinical trial and patients who have been enrolled in the clinical trial. The data from each of the investigative sites is electronically communicated to the centralized data center. Also, the analysis results from each of the diagnostic sites are electronically communicated to the centralized data center.