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The University of California Research eXchange (UC ReX) Data Explorer enables UC investigators to identify the size of potential research study cohorts across the five UC medical centers. Researchers can conduct interactive searches from patient care activities at Davis, Irvine, Los Angeles, San Diego and San Francisco. Data are derived from both inpatient and ambulatory care settings and have been de-identified. Demographics, diagnoses, procedure codes (via ICD-9), top 150+ lab orders, and a proof of concept of four medications data sets are available as of October 2013.

These searches return cohort counts rather than data sets, which can be obtained as explained below.   

The UC ReX Data Explorer is available to all members of the UCSF research community at no charge. To access this tool, researchers must be affiliated with UCSF and have an active MyResearch account.


Accessing UCReX

First-time users:

Please complete the Research Data Tools Request form located in the Enterprise Analytics Dashboard and Data Tools Access Request section To complete this form you need to use your MyAccess credentials. If approved, you will be granted access within 5 business days.

Returning users:

Access the UC ReX Data Explorer using any web browser and Campus Active Directory credentials.

Some users are currently unable to log in to UC ReX. If you are experiencing this issue, you may need to clear your web browser’s cache prior to logging into the upgraded UC ReX system.

Instructions for Internet Explorer


Learn More

Central UC ReX Website

Data Structure - the ontology to which each institute's data was mapped


      • Submit a help ticket at help.ucsf.edu
      • Call the UCSF ITS Service Desk at 415-514-4100
      • Support for the UCReX Data Explorer is available Monday through Friday between the hours of 8 AM and 5 PM.