ESU^U01 — Automated Equipment Status Update
Spontaneous notification of operational status change of a lab analyser. The messenger in LIS / biomedical SCADA supervisions.
Purpose
ESU^U01 is emitted by an analyser as soon as its operational or notification alert state changes. It relies on EQU (identity + state) and ISD (Interaction Status Detail) for verbose event description. Paired with ESR (Equipment Status Request, U02) from the supervision side.
Segment structure
Structure ESU_U01: MSH, EQU, [ISD].
| Segment | Role |
|---|---|
EQU | Equipment Detail — equipment ID, operational state (HL7 0569), notif state (HL7 0568). |
ISD | Interaction Status Detail — sequence, interaction status, free message. |
HL7 0569 (Operational Status) codes: OPER Operational, PM Preventive Maintenance, SD Shut Down, STBY Standby. HL7 0568 (Notification Alert Severity) codes: MAINT None, REQ Maintenance Required, WARN Warning, ERR Error.
Real-world example
Cobas Pro enters preventive maintenance because reagent R3 is low:
MSH|^~\&|ANALYZER|COBAS|MIDDLEWARE|LIS|20260518110000||ESU^U01^ESU_U01|ESU01001|P|2.5.1|||AL|NE
EQU|COBAS_PRO_001|20260518110000||PM^Preventive Maintenance^HL70569|REQ^Maintenance Required^HL70568
ISD|1|REQ^Maintenance Required^HL70568|Reagent R3 level < 10 % — refill before 12:00Acknowledgment (ACK)
MSH|^~\&|MIDDLEWARE|LIS|ANALYZER|COBAS|20260518110001||ACK^U01^ACK|ACKESU01001|P|2.5.1
MSA|AA|ESU01001Common errors
- Empty EQU-4: without Operational Status code, the supervision cannot reason.
- Too long ISD-3: some stacks truncate at 200 chars ; keep the essentials.
- MSH-10 not sequential: the LIS deduplicates poorly across repeated ESU on the same alarm.
- ESU / SSU confusion: ESU = equipment, SSU = specimen.
Related messages
- ESR^U02 — Equipment Status Request (LIS supervision → analyser).
- INR^U06 — Automated Equipment Inventory Request.
- INU^U05 — Automated Equipment Inventory Update.
- SSU^U03 — Specimen Status Update.