HL7 CNS Clear Notification
HL7 field reference CNS fields from HL7 v2.5.1 Show fields
These are the generated fields for the version selected at the top of the page. The document stays the same, but the reference panel follows that version.
Fields
| Field | Name | Required | Repeatable | Type | Table |
|---|---|---|---|---|---|
| CNS.1 | Starting Notification Reference Number | No | No | NM | |
| CNS.2 | Ending Notification Reference Number | No | No | NM | |
| CNS.3 | Starting Notification Date/Time | No | No | TS | |
| CNS.4 | Ending Notification Date/Time | No | No | TS | |
| CNS.5 | Starting Notification Code | No | No | CE | |
| CNS.6 | Ending Notification Code | No | No | CE |
CNS is used in equipment automation workflows to clear a notification once the receiving side has acted on it or no longer needs it displayed.
Equipment and specimen-control segments are used around instruments, analyzers, containers, device commands, device status, and test configuration. They are practical plumbing for lab and automation workflows.
The main trap is treating an equipment status as if it were a clinical result, or treating a specimen/container identifier as if it were interchangeable with a patient or order identifier. Keep the layers separate.
The v2.5.1 structures show CNS in EAC_U07 - Automated equipment command. That tells you where it can appear, but the implementation guide still decides which optional fields are meaningful.
For practical interface work, read the generated field panel for datatype, required, repeatable, and table details, then use the notes below to decide what the field should mean in the receiving workflow.
CNS-1 identifies the Starting Notification Reference Number for this equipment or specimen workflow. Send the identifier that the receiving system actually keys on, and keep the assigning authority or coding system visible when the datatype supports it.
CNS-2 identifies the Ending Notification Reference Number for this equipment or specimen workflow. Send the identifier that the receiving system actually keys on, and keep the assigning authority or coding system visible when the datatype supports it.
CNS-3 is a timing field. Send the real source-system precision, do not pad unknown dates or times, and agree how timezone offsets are handled when time of day matters.
CNS-4 is a timing field. Send the real source-system precision, do not pad unknown dates or times, and agree how timezone offsets are handled when time of day matters.
CNS-5 identifies the Starting Notification Code for this equipment or specimen workflow. Send the identifier that the receiving system actually keys on, and keep the assigning authority or coding system visible when the datatype supports it.
CNS-6 identifies the Ending Notification Code for this equipment or specimen workflow. Send the identifier that the receiving system actually keys on, and keep the assigning authority or coding system visible when the datatype supports it.