An HL7 Observation Result (ORU) message contains information about a patient’s clinical observations and is used in response to an order generated in a clinical system (HL7 ORM message). ORU messages are most commonly used within the context of EKG studies, laboratory results, imaging studies, and medical interpretations. They have also been used to communicate order and results information for the purpose of clinical trials (e.g. drug development). It is important to note that ORU messages do not natively contain images, but use a combination of text, codes and numbers to communicate results.
The ORU message has only two different message types:
Below is an example of an HL7 version 2.4 ORU^R01 message:
MSH|^~\&|MESA_RPT_MGR|EAST_RADIOLOGY|iFW|XYZ|||ORU^R01|MESA3b|P|2.4||||||||
PID|||CR3^^^ADT1||CRTHREE^PAUL|||||||||||||PatientAcct||||||||||||
PV1||1|CE||||12345^SMITH^BARON^H|||||||||||
OBR|||||||20010501141500.0000||||||||||||||||||F||||||||||||||||||
OBX|1|HD|SR Instance UID||1.113654.1.2001.30.2.1||||||F||||||
OBX|2|TX|SR Text||Radiology Report History Cough Findings PA evaluation of the chest demonstrates the lungs to be expanded and clear. Conclusions Normal PA chest x-ray.||||||F||||||
CTI|study1|^1|^10_EP1
Segment |
Description |
| MSH |
Message Header. This segment is a mandatory part of an ORU message, and contains information about the message sender and receiver, the date and time that the message was created. This segment is required. |
| PID |
Patient Identification. An ORU message is a patient-specific message type, and must be linked to a particular patient. Therefore, patient information such as the patient identifier, name, date of birth, etc. must be included in an ORU. This segment is required. |
|
PV1 |
Patient Visit. This segment contains information about patient visit details such as servicing facility, attending doctor, and visit ID. This segment is required. |
|
OBR |
Observation Request. This segment identifies the observation that was ordered in order to generate the ORU message. This segment is required.
|
|
[{OBX}] |
Observation Segment. Here is where information about the observation results is held. An OBX segment is used to communicate a single observation, so multiple observations would require this segment to repeat. This segment is optional and can be repeating. |
|
[{CTI}] |
Clinical Trial Identification. This is an optional segment and is only used if the results need to be linked to a clinical trial. Information such as the trial ID, study phase, and time point is included here. This segment is optional and can be repeating. |
|
[ ] = optional, { } = repeating |
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For more information on implementing various HL7 message types, please refer to the HL7 Messaging Standard Implementation Guides corresponding to your required version.
REFERENCES:
Other HL7 Message Types:
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