| Code | Display | Definition | V2 Concept Comment | HL7 Concept Usage Notes | V2 Concept Comment | HL7 Concept Usage Notes |
| BS | Bank residual specimen | Requests that the specimen should be stored long term | | | | |
| CR | Confirm results value | Requests verification of previously reported results | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| FP | Store residual specimen pending follow up | Requests that the specimen should be saved for a short duration until follow up is completed | Provides instructions for Specimen storage, Provides instructions for Specimen storage | | Provides instructions for Specimen storage, Provides instructions for Specimen storage | |
| IN | Interpret results | Requests interpretation of previously reported results | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| IR | Review clinically inconsistent results | Requests comparison of previously reported results amongst themselves | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| IT | Incorrect test performed | For process improvement work this code can be used to identify when an incorrect test was performed for the target order | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| OP | Test ordering problem | For process improvement work this code can be used to identify orders and the respective results, where problems occurred during ordering | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| PI | Patient identification problem | For process improvement work this code can be used to identify when a patient identification issue has occurred on the target order | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| SI | Suspected interference | Requests verification of previously reported results due to suspected interference | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| SP | Sampling problem | For process improvement work this code can be used to identify orders, where problems occurred during sample collection | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| TP | Specimen transport problem | For process improvement work this code can be used to identify orders, where problems occurred during sample transport | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| TT | Turnaround time problem | For process improvement work this code can be used to identify results with excessive reporting delay | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |
| XR | Incorrect results | For process improvement work this code can be used to identify when incorrect result were reported for the target order | | Used to indicate why review is requested, Used to indicate why review is requested | | Used to indicate why review is requested, Used to indicate why review is requested |