OBX - Observation segment (HL7 v2.3)
Versions: v2.3 v2.3.1 v2.4 v2.5.1 v2.6 v2.7.1
The OBX segment (Observation segment) has 17 fields in HL7 v2.3. Fields are addressed as
OBX-n; composite fields break into components OBX-n.m. Paste a message into the
parser to see every field annotated with this table.
| # | Name | Type | Len | Opt | Repeats | Table |
|---|---|---|---|---|---|---|
| 1 | Set ID - OBX | SI | 4 | Optional | No | |
| 2 | Value Type | ID | 2 | Required | No | 0125 |
| 3 | Observation Identifier | CE | 590 | Required | No | |
| 4 | Observation Sub-ID | ST | 20 | Optional | No | |
| 5 | Observation Value | VARIES | 65536 | Optional | Yes | |
| 6 | Units | CE | 60 | Optional | No | |
| 7 | References Range | ST | 10 | Optional | No | |
| 8 | Abnormal Flags | ID | 5 | Optional | Max 5 | 0078 |
| 9 | Probability | NM | 5 | Optional | No | |
| 10 | Nature of Abnormal Test | ID | 2 | Optional | No | 0080 |
| 11 | Observ Result Status | ID | 1 | Required | No | 0085 |
| 12 | Date Last Obs Normal Values | TS | 26 | Optional | No | |
| 13 | User Defined Access Checks | ST | 20 | Optional | No | |
| 14 | Date/Time of the Observation | TS | 26 | Optional | No | |
| 15 | Producer's ID | CE | 60 | Optional | No | |
| 16 | Responsible Observer | XCN | 80 | Optional | No | |
| 17 | Observation Method | CE | 80 | Optional | Yes |
Synthetic example
OBX|1|NM|718-7^Haemoglobin^LN||128|g/L|130-180|L|||F|||20260823103000