OBX - Observation/Result (HL7 v2.7.1)
Versions: v2.3 v2.3.1 v2.4 v2.5.1 v2.6 v2.7.1
The OBX segment (Observation/Result) has 26 fields in HL7 v2.7.1. 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 | 3 | Conditional | No | 0125 |
| 3 | Observation Identifier | CWE | Required | No | ||
| 4 | Observation Sub-ID | ST | Conditional | No | ||
| 5 | Observation Value | ST | Conditional | Yes | ||
| 6 | Units | CWE | Optional | No | ||
| 7 | References Range | ST | Optional | No | ||
| 8 | Interpretation Codes | CWE | Optional | Yes | ||
| 9 | Probability | NM | Optional | No | ||
| 10 | Nature of Abnormal Test | ID | 2 | Optional | Yes | 0080 |
| 11 | Observation Result Status | ID | 1 | Required | No | 0085 |
| 12 | Effective Date of Reference Range | DTM | Optional | No | ||
| 13 | User Defined Access Checks | ST | Optional | No | ||
| 14 | Date/Time of the Observation | DTM | Optional | No | ||
| 15 | Producer's ID | CWE | Optional | No | ||
| 16 | Responsible Observer | XCN | Optional | Yes | ||
| 17 | Observation Method | CWE | Optional | Yes | ||
| 18 | Equipment Instance Identifier | EI | Optional | Yes | ||
| 19 | Date/Time of the Analysis | DTM | Optional | No | ||
| 20 | Observation Site | CWE | Optional | Yes | 0163 | |
| 21 | Observation Instance Identifier | EI | Optional | No | ||
| 22 | Mood Code | CNE | Conditional | No | 0725 | |
| 23 | Performing Organization Name | XON | Optional | No | ||
| 24 | Performing Organization Address | XAD | Optional | No | ||
| 25 | Performing Organization Medical Director | XCN | Optional | No | ||
| 26 | Patient Results Release Category | ID | 10 | Optional | No | 0909 |
Synthetic example
OBX|1|NM|718-7^Haemoglobin^LN||128|g/L|130-180|L|||F|||20260823103000