The i2b2 Cohort Discovery Tool provides an easy-to-use, self-service method for MCW researchers to query the CTSI’s Clinical Research Data Warehouse (CRDW) to answer the question “Does the CRDW contain a cohort of patients with certain characteristics?”. Search criteria can include patient demographics, ICD-9 coded diagnoses, CPT and HCPCS coded procedures, laboratory test results, medication orders by class or ingredient, clinical encounter metadata and MCW Tissue Bank biospecimen variables.
i2b2 queries return an approximate number of distinct patients matching the search criteria. No patient identifiers are revealed. All i2b2 users create their own library of queries which can be re-run as the data warehouse expands or re-used as components within new queries.
The Froedtert Health System (FH) and Children’s Hospital of Wisconsin (CHW) have separate data warehouses and toolsets. Generally, the FH system contains ~10% children and CHW contains ~10% adults.