... chemical and pharmaceutical industries. An assay is the act of checking blood levels to evaluate the potency of the drug and to ensure adequate dosing. an analysis of a substance, esp. Limit test and assay are two methods involved in the determination of components in a sample. What is a Limit Test – Definition, Features, Importance 2. 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. Cell-based assays provide invaluable biological information about cellular processes, cellular viability, drug mechanisms of action, and off-target effects. 1. Assay definition, to examine or analyze: to assay a situation; to assay an event. In contrast, an assay both qualify and quantify the key component of the sample. 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 . 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). ... Bullion Definition. They are important analytical procedures in drug development. of an ore or drug: His find required an assay … to judge the worth of : estimate. An assay is a process of analyzing a substance to determine its composition or quality. 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 ]. What is an Assay assay: [verb] to analyze (something, such as an ore) for one or more specific components. assay synonyms, assay pronunciation, assay translation, English dictionary definition of assay. 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). 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. 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. 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. assay [as´a] determination of the purity of a substance or the amount of any particular constituent of a mixture. assay [as´a] determination of the purity of a substance or the amount of any particular constituent of a mixture. 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). See more. An assay is used for some medications. Define assay. Key Areas Covered.