| Qualifier Code | Qualifier Short Description | Extended Description |
| E | Estimated value (exceeded calibration range) | Reported result is an estimate because it exceeds the calibration range. |
| G | Estimated minimum value (result likely higher) | Value is likely greater than result reported; result is an estimated minimum value. |
| J | Approximate concentration (positively identified) | The analyte was positively identified; the associated numerical value is the approximate concentration of the analyte in the sample. |
| N | Tentatively identified as present | The analysis indicates the present of an analyte for which there is presumptive evidence to make a “tentative identification”. |
| NJ | Approximate concentration (tentatively identified) | The analysis indicates the presence of an analyte that has been “tentatively identified” and the associated numerical value represents its approximate concentration. |
| NAF | Not analyzed for | Not analyzed for. |
| NC | Not calculated | Not calculated. |
| REJ | Unverified presence or absence (cannot meet QC criteria) | The sample results are rejected due to serious deficiencies in the ability to analyze the sample and meet quality control criteria. The presence or absence of the analyte cannot be verified. |
| U | Not detected at or above the reported QL | The analyte was not detected at or above the reported sample quantitation limit. |
| UJ | Not detected at or above the reported approximate QL | The analyte was not detected at or above the reported sample quantitation limit. However, the reported quantitation limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately measure the analyte in the sample. |