The OBX segment is documented in its entirety in Chapter 7. Its usage as it applies to Medical Records/ Information Management is documented here for clarity.

Figure 9-4. OBX attributes

17
C.LenElementv2.3FHIR
1..4-SIO1-00569OBX-1Set ID - OBX-
2..3-IDC1012500570OBX-2Value Type2-
3..80-CER1-00571OBX-3Observation IdentifierLength3 mappings
4..20-STC1-00572OBX-4Observation Sub-ID2 mappings
5..65536-variesC*-00573OBX-5Observation Value53 mappings
6..60-CEO1-00574OBX-6Units12 mappings
7..60-STO1-00575OBX-7References RangeLength2 mappings
8..5-IDO5007800576OBX-8Abnormal Flags2 mappings
9..5-NMO5-00577OBX-9ProbabilityRepetition-
10..2-IDO1008000578OBX-10Nature of Abnormal Test4 mappings
11..1-IDR1008500579OBX-11Observation Result StatusName12 mappings
12..26-TSO1-00580OBX-12Date Last Obs Normal ValuesOptionality-
13..20-STO1-00581OBX-13User Defined Access Checks-
14..26-TSO1-00582OBX-14Date/Time of the Observation2 mappings
15..60-CEO1-00583OBX-15Producer's IDOptionality2 mappings
16..80-XCNO*-00584OBX-16Responsible ObserverRepetition6 mappings
17..60-CEO*-00936OBX-17Observation MethodLength2 mappings
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