rejection interval 

Synonym: rejection zone
https://doi.org/10.1351/goldbook.08121
Interval of non-permissible measured quantity values.
Note:
Non-permissible measured quantity values are associated with items that do not conform to specified requirements and lie outside the acceptance interval.
Source:
PAC, 2021, 93, 997. (Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)) on page 1039 [Terms] [Paper]