Building the Barts Health Master Data Set for COVID clinical trials and research.
SNOMED CT coded diagnoses are queried in Expression Constraint Language using Snowstorm for diagnoses of interest in Previous Medical History (PMH), COVID-related symptoms, and disease complications.
SNOMED ConceptId's are mapped to DescriptionId's using SNOMED International's latest RF2 files (International concat with UK). Both Concept and Description Id's are saved as a CSV, for searching in Barts Health Data Warehouse.