HL7 EAR_U08 (Automated Equipment Response) | Integration Soup HL7 Reference Guide

HL7 EAR_U08 Automated Equipment Response

The equipment answers the command, not just the message receipt.

HL7 message structure EAR_U08 groups and segments from HL7 v2.5.1 Hide structure

These are the generated groups and segments for the version selected at the top of the page. The article explains the workflow, and this panel follows the chosen HL7 version.

Message Structure

Segment	Name	Required	Repeatable
MSH	Message Header	Yes	No
SFT	Software Segment	No	Yes
EQU	Equipment Detail	Yes	No
EAR_U08.COMMAND_RESPONSE	Command Response group	Yes	Yes
ECD	Equipment Command	Yes	No
EAR_U08.SPECIMEN_CONTAINER	Specimen Container group	No	No
SAC	Specimen Container detail	Yes	No
SPM	Specimen	No	Yes
ECR	Equipment Command Response	Yes	No
ROL	Role	No	No

EAR_U08 is the equipment response to a previously issued command, usually an EAC_U07. It tells the commanding system whether the device accepted, rejected, completed, failed, or otherwise responded to the requested action.

This response matters because an ACK is too thin for command control. ACK says the message was processed. EAR_U08 says what happened to the command itself.

A small EAR U08 example

MSH|^~\&|TRACK01|CORELAB|LAS|CITYHOSP|20260723111015||EAR^U08^EAR_U08|EAR080001|P|2.5.1 EQU|TRACK01^Automation Track 1^CITYHOSP|20260723111015|BUSY^Busy^HL70365|REMOTE^Remote control^L|N^Normal^HL70367 ECD|800101|LOADCARRIER^Load carrier^L|Y^Yes^HL70136|20260723111000|RACK7 SAC|||TUBE12345^CITYHOSP|||||||RACK^Rack^L|RACK7|04 SPM|1|SPEC12345^CITYHOSP||SER^Serum^HL70487 ECR|OK^Command accepted^HL70387|20260723111012|Carrier loaded successfully

What workflow it represents

The equipment is closing the loop on a command. Depending on the profile, the response may mean accepted for execution, completed, rejected, failed, or completed with warnings.

Receivers use EAR_U08 to update operator screens, release the next automation step, retry safely, or put the work item into an exception queue.

How to read the structure

MSH identifies the response event. Optional SFT can describe software. Required EQU identifies the responding equipment.

Each COMMAND_RESPONSE group includes required ECD so the response can be matched to the original command. Optional SAC and SPM preserve specimen/container context. Required ECR carries the actual command response and completion time.

Implementation traps

Do not treat all positive responses as completion. Some devices distinguish accepted, started, completed, and completed with warning. If your profile collapses those states, downstream workflow may move too early.

Always correlate by command reference, not by timing alone. In a busy automation line, two commands can be issued seconds apart to the same equipment.

Free-text response parameters are useful for support, but they should not be the only place a receiver can discover whether the command succeeded.

Reference notes

HL7 v2+ describes EAR_U08 as the response to previously issued equipment commands, such as automated equipment answering a Laboratory Automation System.