homogeneous assay

https://doi.org/10.1351/goldbook.14146
Assay in which all reagents and reactants are of a uniform phase (typically, liquid phase) and assay response is detected without the need for physical separation of assay components.
Source:
PAC, 2011, 83, 1129. (Glossary of terms used in biomolecular screening (IUPAC Recommendations 2011)) on page 1143 [Terms] [Paper]