secondary screen

https://doi.org/10.1351/goldbook.14191
Screen applied to independently confirm actives from the primary screen.
Note: A secondary screen may employ an assay that differs in type from the primary screen (e.g., biochemical assay vs. cell-based assay) or it may be of the same type with different readout.
Source:
PAC, 2011, 83, 1129. (Glossary of terms used in biomolecular screening (IUPAC Recommendations 2011)) on page 1154 [Terms] [Paper]