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Clinical Document Architecture (CDA) explained

October 28th, 2009

Clinical Document Architecture (CDA) is an XML-based standard used for clinical document exchange within Health Level Seven framework. 

CDA has three levels of document definition, distinguished by the degree of granularity of the markup. Level One providing the least structure and Levels Two and Three providing increasing granularity.
Level One consists of Header, Body and HL7 Datatypes
Level Two includes Domain specializations 
Level Three includes full document semantics aimed to meet the machine processing requirement
HL7 Datatypes are defined for:
- Character strings and display data
- Codes and identifiers 
- Quantities
And Coded CDA components or elements are based on (SNOMED) and have the two-letter ending "cd". 

Here is an sample CDA level three:


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