An<unk>  is a procedure where a property or concentration of an analyte is measured.
There are numerous types of<unk> s, such as an antigen<unk> pture<unk> , bioassay, competitive protein binding<unk> , crude oil<unk> , four-point<unk> , immunoassay, microbiological<unk> , stem cell<unk> , and many others, including concentration<unk> s.
Assay
Avolition
Supination
Measure 
Exaptation
Feedback
Staining
Presentation 