A.7.2.4 PurposeOfReference
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#### A.7.2.4 PurposeOfReference

Describes the purpose the DICOM composite object reference is made for. Appropriate codes such as externally defined DICOM codes may be used to specify the semantics of the purpose of reference. When absent, implies that the reason for the reference is unknown.

Codes specified in PS3.16 shall be used to designate the coded purpose of reference by using the value attribute. Candidate codes are contained in the DICOM Context Group 7003. The attribute mapping for the code attributes are listed in table 3.

Table A.7.2-3. DICOM Coded Purpose of Reference in an HL7 V3 Act

Attribute | Data Type | Multiplicity | Value
--- | --- | --- | ---
classCode | CS | 1..1 | OBS
moodCode | CS | 1..1 | EVN
templateId | LIST<II> | 1..* |
code | CD | 1..1 | <"ASSERTION" as code property, 2.16.840.1.113883.5.4 as codeSystem property> (HL7 observation type code specified for assertions)
value | CD | 1..1 | < Code Value (0008,0100) as code property, 1.2.840.10008.2.16.4 as codeSystem property, Coding Scheme Designator (0008,0102) as codeSystemName property, Code Meaning (0008,0104) as displayName property>

##### A.7.2.4.1 CDA Mapping (Class Name and Attributes used for CDA Documents)

- Act Clone Name: Observation

- Act clone name of the CDA entry is "Observation" instead of "PurposeOfReference"

- The attributes and attribute values of this "Observation" CDA entry are identical to those listed in table 3

- templateId value (Table A.7.1-3): Set root portion of II to "2.16.840.1.113883.10.20.6.2.9" (identifies the template that defines constraints on "Purpose of Reference Observation" of CDA Diagnostic Imaging Reports as specified by CDA R2 DIR IG).

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