Out of specification (OOS)
A result outside the acceptance criteria. Requires investigation before it can be invalidated; a result cannot be discarded because it is inconvenient.
Related terms
- Specification
- A decision about what result is acceptable. Not a measurement. Conflating the two is how "≥ 99.0 %" becomes "99.0 %" on a certificate.
see also Rule AX-R04 · Certificate of analysis (COA)
Where this term appears
The glossary exists to make record pages readable without a chemistry degree. Every technical term on a report resolves here.
- Assay report records — the term appears in result tables, peak tables and provenance blocks
- Method references — where the measurement behind the term is defined
- All 5 glossary terms beginning with O