OBX Segment

Field Description Type Usage Notes/Comments
OBX-1

Set ID – OBX

SI R
OBX-2

Value Type

ID O

Preferred values from HL7 Table 0125

OBX-3

Observation Identifier

CE R

LOINC codes preferred for lab results and vital signs. Local coding systems are supported but a canonical system is strongly preferred.

OBX-4

Observation Sub-ID

ST RE
OBX-5

Observation Value

varies R
OBX-6

Units

CE RE
OBX-7

References Range

ST RE
OBX-8

Abnormal Flags

IS RE

Preferred values from HL7 Table 0078. If local codes are used a dictionary of the codes used will be needed.

OBX-9

Probability

NM X
OBX-10

Nature of Abnormal Test

ID X
OBX-11

Observation Result Status

ID RE

Preferred values from HL7 Table 0085. If local codes are used a dictionary of the codes used will be needed.

OBX-12

Effective Date of Reference Range Values

TS X
OBX-13

User Defined Access Checks

ST X
OBX-14

Date/Time of the Observation

TS R
OBX-15

Producer’s Reference

CE X
OBX-16

Responsible Observer

XCN X
OBX-17

Observation Method

CE O
OBX-18

Equipment Instance Identifier

EI X
OBX-19

Date/Time of the Analysis

TS RE
OBX-20

Reserved for harmonization with V2.6

OBX-21

Reserved for harmonization with V2.6

OBX-22

Reserved for harmonization with V2.6

OBX-23

Performing Organization Name

XON RE
OBX-24

Performing Organization Address

XAD RE
OBX-25

Performing Organization Medical Director

XCN RE