Mappings for the observation resource.
 | Observation | Observation[classCode=OBS, moodCode=EVN] | 
 | code | code | 
 | value[x] | value | 
 | dataAbsentReason | value.nullFlavor | 
 | interpretation | interpretationCode | 
 | comments | subjectOf.observationEvent[code="annotation"].value | 
 | applies[x] | effectiveTime | 
 | issued | participation[typeCode=AUT].time | 
 | status | status 
 Amended & Final are differentiated by whether it is the subject of a ControlAct event with a type of "revise"
 | 
 | reliability | uncertaintyCode | 
 | bodySite[x] | targetSiteCode | 
 | method | methodCode | 
 | identifier | id | 
 | subject | participation[typeCode=SBJ] | 
 | specimen | participation[typeCode=SPC].specimen | 
 | performer | participation[typeCode=PRF] | 
 | device | participation[typeCode=DEV] | 
 | encounter | inboundRelationship[typeCode=COMP].source[classCode=ENC, moodCode=EVN] | 
 | referenceRange | outboundRelationship[typeCode=REFV]/target[classCode=OBS, moodCode=EVN] | 
 | low | value:IVL_PQ.low | 
 | high | value:IVL_PQ.high | 
 | meaning | interpretationCode | 
 | age | outboundRelationship[typeCode=PRCN].targetObservationCriterion[code="age"].value | 
 | text | value:ST | 
 | related | outBoundRelationship | 
 | type | .typeCode | 
 | target | .targetObservation | 
 | Observation | OBX | 
 | code | OBX-3-observation identifier | 
 | value[x] | OBX.2, OBX.5, OBX.6 | 
 | dataAbsentReason | N/A | 
 | interpretation | OBX-8-interpretation codes | 
 | comments | NTE.3 (partner NTE to OBX, or sometimes another (child?) OBX) | 
 | applies[x] | OBX-14-date/time of the observation, and/or OBX-19 after v2.4  (depends on who observation made) | 
 | issued | OBR.22 (or MSH.7), or perhaps OBX-19 (depends on who observation made) | 
 | status | OBX-11-observation result status | 
 | reliability | Maybe OBX.8/OBX.9 | 
 | bodySite[x] | OBX-20-observation site | 
 | method | OBX-17-observation method | 
 | identifier | OBX.21 | 
 | subject | PID-3-patient ID list | 
 | specimen | SPM segment | 
 | performer | OBX.15 / (Practitioner)  OBX-16-responsible observer,  PRT-5-participation person:PRT-4-participation='RO' / (Device)  OBX-18-equipment instance identifier , PRT-10-participation device:PRT-4-participation='EQUIP' / (Organization)  OBX-23-performing organization name,  PRT-8-participation organization:PRT-4-participation='PO'
 | 
 | device | OBX-17 / PRT -10 | 
 | encounter | PV1 | 
 | referenceRange | OBX.7 | 
 | low | OBX-7-references range | 
 | high | OBX-7-references range | 
 | meaning | OBX-10-nature of abnormal test? | 
 | age |  | 
 | text | OBX-7-references range | 
 | related | Relationships established by OBX-4 usage | 
 | type | N/A | 
 | target |  |