Clinical Quality Language deep dive
summary
Clinical Quality Language (CQL) is an HL7 expression standard for sharing executable clinical logic using FHIR; the session shows building a decision support rule and a quality measure, producing ELM (an ELM machine-friendly AST) and demonstrating transpiles to SQL, JavaScript and C# via existing translators. Example: an eCQM Warfarin query finds inpatient encounters where Warfarin and parenteral anticoagulant overlap ≥5 days and the last INR ≥2 before stop. Data access uses model infos, provider interfaces and terminology servers; translators work but require schema and terminology/versioning decisions. value set membership using "in" and tilde equivalence
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chapters (15)
- 0:00Introduction and speaker intro
- 1:07Learning objectives and CQL fundamentals
- 3:12Clinical Quality Framework and CQL history
- 5:40Types of interoperability and CQL focus
- 8:20CQL architecture and design principles
- 10:30CQL language constructs and syntax
- 12:34Handling missing data and type conversions
- 15:00Operators and temporal logic in CQL
- 18:11Intervals, lists, and clinical data modeling
- 21:00CQL library structure and models
- 23:30Terminology support in CQL
- 26:46Data access and retrieval in CQL
- 29:35CQL query structure and clauses
- 31:47Advanced query example: Warfarin therapy
- 37:06Summary and Q&A session
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