IMMUNOASSAY
immunoassay, immunochemical assay
(noun) identification of a substance (especially a protein) by its action as an antigen; “PSA in the blood can be measured with an immunochemical assay”
Source: WordNet® 3.1
Etymology
Noun
immunoassay (plural immunoassays)
A test for the presence of a substance using the reaction of an antibody to its antigen, making use of the high selectivity of components of biological immune systems.
Verb
immunoassay (third-person singular simple present immunoassays, present participle immunoassaying, simple past and past participle immunoassayed)
To carry out such a test.
Source: Wiktionary