Code system of concepts describing the urgency of a request carried in an order. Used in HL7 Version 2.x messaging in timing/quantity; in older versions of the Standard was used in the TQ datatype, but in later versions it is used in the TQ1 segment (which replaced the TQ datatype which has been withdrawn).
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This code system http://terminology.hl7.org/CodeSystem/v2-0485 defines the following codes:
| Code | Display | Definition | V2 Table Status | V2 Concept Comment | V2 Concept Comment As Published |
| S | Stat | Stat | A | With highest priority | With highest priority |
| A | ASAP | ASAP | A | Fill after S orders | Fill after S orders |
| R | Routine | Routine | A | Default | Default |
| P | Preop | Preop | A | | |
| C | Callback | Callback | A | | |
| T | Timing critical | Timing critical | A | A request implying that it is critical to come as close as possible to the requested time, e.g., for a trough anti-microbial level. | A request implying that it is critical to come as close as possible to the requested time, e.g., for a trough anti-microbial level. |
| TS<integer> | Timing critical within <integer> seconds. | Timing critical within <integer> seconds. | D | This is not a real code, but guidelines how to construct the codes. | Timing critical within <integer> seconds. |
| TM<integer> | Timing critical within <integer> minutes. | Timing critical within <integer> minutes. | D | This is not a real code, but guidelines how to construct the codes. | Timing critical within <integer> minutes. |
| TH<integer> | Timing critical within <integer> hours. | Timing critical within <integer> hours. | D | This is not a real code, but guidelines how to construct the codes. | Timing critical within <integer> hours. |
| TD<integer> | Timing critical within <integer> days. | Timing critical within <integer> days. | D | This is not a real code, but guidelines how to construct the codes. | Timing critical within <integer> days. |
| TW<integer> | Timing critical within <integer> weeks. | Timing critical within <integer> weeks. | D | This is not a real code, but guidelines how to construct the codes. | Timing critical within <integer> weeks. |
| TL<integer> | Timing critical within <integer> months. | Timing critical within <integer> months. | D | This is not a real code, but guidelines how to construct the codes. | Timing critical within <integer> months. |
| PRN | As needed | As needed | A | | |