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OG - observation grouper

HL7 Component Table - OG - observation grouper
Seq# Description Implement Flags Cardinality Length C.LEN Vocabulary Data Type
1 Original Sub-Identifier = [0..1]  20 ST
2 Group [0..1]     NM
3 Sequence [0..1]     NM
4 Identifier [0..1]     ST

Components: <Original Sub-Identifier (ST)> & <Group (NM)> & <Sequence (NM)> & <Identifier (ST)>

Definition: The components that can be used to define the structure of the observation/result segments (OBX) within an observation report segment (OBR).

Example: Original Mode - |1.3 2| where the dot and space are locally defined; Enhanced Mode - |^1^3^2| where the standard defines the purpose of the components to enable grouping.

Note: In original mode, OG.1 plus OBX-3 provides uniqueness; in enhanced mode OG.2 and OG.3 plus OBX-3 will provide uniqueness; OG.4 may not be present.

OG-1: Original Sub-Identifier (ST)

Definition: The Original Sub-Identifier component represents the original data type used in OBX-4 to enable backwards compatibility to continue use of the original format to provide OBX segment grouping.

OG-2: Group (NM)

Definition: The Group component indicates the group and its sequence within the OBR segment that the OBX segment is a part of.

OG-3: Sequence (NM)

Definition: The Sequence component indicates the sequence within the group as defined in OG-2.

OG-4: Identifier (ST)

Definition: The Identifier component enables assignment of an identifier to a result component, for example an isolate in a microbiology message. Futher guidance on how to use this field will be found in an Implementation Guide.