Define assay. An immunoassay is a biochemical test that measures the presence or concentration of a macromolecule or a small molecule in a solution through the use of an antibody (usually) or an antigen (sometimes). However, with the development of new technologies, there is increasing interest in the use of label-free cellular assays that utilize biophysical detection methods [ 30 - 32 ]. assays (assays with highly variable quantitative readout, e.g., response in an animal model), broader acceptance ranges may be considered for determining assay robustness and assay consistency. The global market for cell-based assays was an estimated $17 billion in 2016 and is expected to reach $28 billion by 2021, with the United States comprising half the market 1 . of an ore or drug: His find required an assay … An assay is used for some medications. assay synonyms, assay pronunciation, assay translation, English dictionary definition of assay. to judge the worth of : estimate. What is a Limit Test – Definition, Features, Importance 2. Limit test and assay are two methods involved in the determination of components in a sample. An assay is a process of analyzing a substance to determine its composition or quality. assay [as´a] determination of the purity of a substance or the amount of any particular constituent of a mixture. ... chemical and pharmaceutical industries. Drug Assay (Active Ingredients and Dosage Forms) An assay is an investigative (analytic) procedure for qualitatively assessing or quantitatively measuring the presence, amount, or functional activity of a target entity (the analyte). assay [as´a] determination of the purity of a substance or the amount of any particular constituent of a mixture. biological assay bioassay; determination of the potency of a drug or other substance by comparing the effects it has on animals with those of a reference standard. 1. An assay is the act of checking blood levels to evaluate the potency of the drug and to ensure adequate dosing. See more. They are important analytical procedures in drug development. an analysis of a substance, esp. Key Areas Covered. assay: [verb] to analyze (something, such as an ore) for one or more specific components. Cell-based assays provide invaluable biological information about cellular processes, cellular viability, drug mechanisms of action, and off-target effects. High-throughput assays used in drug discovery frequently use fluorescent and luminescent reporters to enable large numbers of assays to be performed in an automated fashion. biological assay bioassay; determination of the potency of a drug or other substance by comparing the effects it has on animals with those of a reference standard. Assay definition, to examine or analyze: to assay a situation; to assay an event. What is an Assay ... Bullion Definition. In contrast, an assay both qualify and quantify the key component of the sample. secondary assays (and tertiary assays): Undertaken after primary screening has identified "hit" compounds against drug targets, are more complicated - and time-consuming - tests of a drug and include ADME/Tox (absorption, distribution, metabolism, excretion/toxicology) studies (e.g., done on mice or rats).