| EffortQACode | EffortQADescr | LastUpdateDate |
| BQC | Taxonomy sample subjected to laboratory external quality control | 2017-04-19 |
| None | None - No QA Qualifier | 2009-11-22 |
| NR | Not Recorded | 2017-11-30 |
| RPV | Sample failed to meet representativeness requirements | 2012-11-06 |