| Code | Description | Version |
| < | Below absolute low-off instrument scale | from v2.1 |
| > | Above absolute high-off instrument scale | added v2.2 |
| A | Abnormal (applies to non-numeric results) | from v2.1 |
| AA | Very abnormal (applies to non-numeric units, analogous to panic limits for numeric units) | from v2.1 |
| AC | Anti-complementary substances present | added v2.7 |
| B | Better-use when direction not relevant | added v2.2 |
| D | Significant change down | from v2.1 |
| DET | Detected | added v2.7 |
| H | Above high normal | from v2.1 |
| HH | Above upper panic limits | from v2.1 |
| I | Intermediate. Indicates for microbiology susceptibilities only. | from v2.1 |
| IND | Indeterminate | added v2.7 |
| L | Below low normal | added v2.2 |
| LL | Below lower panic limits | from v2.1 |
| MS | Moderately susceptible. Indicates for microbiology susceptibilities only. | from v2.1 |
| N | Normal (applies to non-numeric results) | added v2.2 |
| ND | Not Detected | added v2.7 |
| NEG | Negative | added v2.7 |
| NR | Non-reactive | added v2.7 |
| POS | Positive | added v2.7 |
| QCF | Quality Control Failure | added v2.7 |
| R | Resistant. Indicates for microbiology susceptibilities only. | from v2.1 |
| RR | Reactive | added v2.7 |
| S | Susceptible. Indicates for microbiology susceptibilities only. | from v2.1 |
| TOX | Cytotoxic substance present | added v2.7 |
| U | Significant change up | from v2.1 |
| VS | Very susceptible. Indicates for microbiology susceptibilities only. | from v2.1 |
| W | Worse-use when direction not relevant | added v2.2 |
| WR | Weakly reactive | added v2.7 |
| null | No range defined, or normal ranges don't apply | from v2.1 |