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This request returns the observation blob using the observation primary key.
Example:
<message_body>
<pdoheader>
<request_type>get_observationfact_by_primary_key</request_type>
</pdoheader>
<ns5:request xsi:type="ns5:GetObservationFactByPrimaryKey_requestType" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<fact_primary_key>
<event_id>2004005981</event_id>
<patient_id>52003</patient_id>
<concept_cd>LCS-I2B2:c1009c</concept_cd>
<observer_id>03840261</observer_id>
<start_date>1995-08-24T00:00:00.179-05:00</start_date>
<instance_num>1</instance_num>
</fact_primary_key>
<fact_output_option select="using_filter_list" onlykeys="false"/>
</ns5:request>
<response>
<patient_data>
<observation_set>
<observation>
<event_id source="source3">event_id3</event_id>
<patient_id>patient_id9</patient_id>
<concept_cd name="name0">concept_cd3</concept_cd>
<observer_cd soruce="soruce0">observer_cd3</observer_cd>
<start_date>2006-05-04T18:13:51.0Z</start_date>
<instance_num>1</instance_num>
<observation_blob>

<!\[CDATA\[

patient notes]]>
</observation_blob>
</observation >
</observation_set>
</patient_data>
</response>
</message_body>

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