What is assay?

  • (noun): A quantitative or qualitative test of a substance (especially an ore or a drug) to determine its components; frequently used to test for the presence or concentration of infectious agents or antibodies etc..
    See also — Additional definitions below


An assay is an investigative (analytic) procedure in laboratory medicine, pharmacology, environmental biology, and molecular biology for qualitatively assessing or quantitatively measuring the presence or amount or the functional activity of a target entity (the analyte) which can be a drug or biochemical substance or a cell in an organism or organic sample. The measured entity is generally called the analyte, or the measurand or the target of the assay. The assay usually aims to measure an intensive property of the analyte and express it in the relevant measurement unit (e.g. molarity, density, functional activity in enzyme international units, degree of some effect in comparison to a standard, etc.).

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Some articles on assay:

Spontaneous Cerebrospinal Fluid Leak - Diagnosis - Assay
... ear that is potentially CSF, the fluid can be collected and tested with a beta-2 transferrin assay ...
Scintillation Proximity Assay
... Scintillation proximity assay, commonly known as SPA, is a type of technology that is used to assay development and biochemical screening which permit the rapid and sensitive measurement of a broad range of biological ...
Scintillation Proximity Assay - Advantages Over Previous Methods
... over-coated plate-based methods, SPA has a number of advantages that makes it more popular Assay flexibility - the concentration of the components in the assay can be adjusted to suit the user due to the higher ... This method also allows the user to optimize the sensitivity of the assay by altering the quantity of SPA beads ... Convenient - the key component of the SPA assay, the beads, do not depend on a particular plate type or supplier, hence its wide availability ...
List Of Me SH Codes (E05) - MeSH E05 --- Investigative Techniques - MeSH E05.601 --- Molecular Probe Techniques - MeSH E05.601.495 --- Immunoassay
... techniques MeSH E05.601.495.350.170 --- enzyme-linked immunosorbent assay MeSH E05.601.495.350.180 --- enzyme multiplied immunoassay technique MeSH E05.601.495.380 --- immunosorbent techniques MeSH E05.601.495.3 ...
... The CAP-e assay is performed by first incubating red blood cells (erythrocytes) with a test sample at a range of concentrations ... In the next step of the assay, exogenous hydrogen peroxide is added at a concentration of 167 mM to artificially induce severe oxidative stress ... To date, the assay has been used in 2 published studies, both conducted by AIBMR and Holger NIS ...

More definitions of "assay":

  • (noun): A substance that is undergoing an analysis of its components.
  • (noun): A written report of the results of an analysis of the composition of some substance.
  • (noun): An appraisal of the state of affairs.
    Example: "They made an assay of the contents"
    Synonyms: check
  • (verb): Analyze (chemical substances).

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    Geoffrey Chaucer (1340–1400)