April 14, 2026
KEEPER is a community-developed R package to support case validation. Patrick Ryan led an interactive session to help you learn about KEEPER during the April 14 community call. Test yourself against the audience to see how you would adjudicate several cases and see if your choices match that of an LLM. This is a great opportunity to see KEEPER in action and elevate the rigor of your phenotype development process.
Community Updates
• Registration and the call for participation are now open for the 2026 OHDSI Global Symposium, held Oct. 20–22 at the Hyatt Regency in New Brunswick, N.J. The deadline to submit your brief report(s) for the Collaborator Showcase is June 5 at 8 pm ET. Check the Global Symposium section of this newsletter to learn more about our 12 new tutorial offerings.
• The second OHDSI Maternal Health Fellowship is designed to train clinical investigators for improved maternal and neonatal care. This fellowship offers three key components: Career Development, Practice, and Networking. Supported by both the OHDSI community and the NIH IMPROVE initiative, the program focuses on training clinical investigators in observational research methods to enable them to conduct reproducible research and generate real-world evidence. Learn more and register here. The deadline to apply is May 15.
• Ready to turn your data harmonization vision into reality? Join The OMOP School in Stockholm, Sweden May 26-29 for a hands-on bootcamp designed to help you master the OMOP Common Data Model and execute end-to-end mini-harmonization projects. Whether you are a data scientist, researcher, or health data custodian, this intensive workshop provides the actionable tools and OHDSI methods needed to transform your institutional research capabilities.
• The OHDSI community has published more than 950 peer-review studies highlighting the OMOP CDM or OHDSI tools. Learn more about OHDSI research via our improved Community Dashboard. Thank you to our collaborators at Johns Hopkins for leading this initiative.
• Registration is now open for the 2026 Summer School in Observational Health Data Science & Informatics, AI, and Real World Evidence, which will be held June 22-26 at the Columbia University Department of Biomedical Informatics. Now in its second-year, the Columbia OHDSI Summer School provides health professionals, researchers, and industry practitioners with an immersive, hands-on training to working with real-world health data and generating real-world evidence (RWE). Participants will explore the types of healthcare data captured during routine clinical care—such as electronic health records and administrative claims—and learn how to standardize these data using the OMOP Common Data Model to support collaborative, distributed research as part of a data network.
Upcoming Events
• The 2026 OHDSI Europe Symposium will be held April 18-20 in Rotterdam, Netherlands. Find all the details on the event homepage linked above.
• The first OHDSI Latin America Symposium will be held July 30-31 in Salvador, Brazil. The event will include multiple workshops, including sessions focused on Introduction to OMOP, Cohort building, ETL for OMOP, and Scientific collaboration: opportunities for network studies in Latin America.
• The UK Symposium will be held September 18 at the University of Nottingham, preceded by an OMOP Training Day on September 17. The call for abstracts has opened, and the deadline is set for May 1.
• The 2026 OHDSI Global Symposium will be held Oct. 20-22 at the Hyatt Regency Hotel in New Brunswick, N.J. The deadline to submit your brief report(s) for the Collaborator Showcase is June 5 at 8 pm ET. Check the Global Symposium section of this newsletter to learn more about our 12 new tutorial offerings.
Social Showcase
• Research from the 2025 Global Symposium Collaborator Showcase is being shared daily on OHDSI’s LinkedIn, Twitter/X, Instagram and Bluesky social channels as part of the #OHDSISocialShowcase. Below are posters (with study leads) that are featured this week:
Monday — Enhancing Empirical Comparator Recommendations With User Specified Weights: Approach and Assessment (Cameron R. Atkins)
Tuesday — Summarizing FHIR® to OMOP Transformation Exceptions using Generative AI (Ron Sweeney)
Wednesday — Athena-Client: A Community Python SDK for Programmatic Access to the OHDSI Athena Vocabulary Repository (Alvaro A. Alvarez)
Thursday — Evaluating confounding adjustment when sample size is small (Fleur Vereijken)
Friday — Fix What’s Broke: A Use Case-Driven Framework for Vocabulary Update and Maintenance (Asieh Golozar)
Slides
Phenotype Aphril Week 2: Phenotype Evaluation Using Keeper | Community Updates
