ASSAY definition: 1. to examine a substance to find out how pure it is or what its properties (= qualities) are: 2…. Learn more. 🔍 TL;DR: What Is an Assay Test? (Quick Answer) An **assay test** is a scientific procedure used to measure the **concentration, purity, or effectiveness** of a substance—whether it’s a **drug, chemical, mineral, or biological sample**. Think of it like a **quality control check** for labs, manufacturers, or researchers. It helps ensure accuracy in **medicine, agriculture, environmental. An assay is a laboratory procedure that identifies or measures a specific substance in a sample. Whether it’s checking how much of a drug is in a tablet, detecting bacteria on a kitchen surface, or measuring hormone levels in your blood, the underlying process is an assay. The word “assay” and “test” are often used interchangeably in medical and scientific settings, but an assay is. Define assay. assay synonyms, assay pronunciation, assay translation, English dictionary definition of assay. an analysis of a substance, esp. of an ore or drug: His find required an assay to determine its value. ASSAY definition: to examine or analyze. See examples of assay used in a sentence. The meaning of ASSAY is to analyze (something, such as an ore) for one or more specific components. How to use assay in a sentence. Did you know? 8 meanings: (əˈseɪ ) 1. to subject (a substance, such as silver or gold) to chemical analysis, as in the determination of the. Click for more definitions. An assay is a breakdown of a material, examining the individual parts that make up the whole. When you assay a situation, you look at all the elements that created the problem in order to come up with a solution. Assay An assay is an investigative (analytic) procedure in laboratory medicine, mining, pharmacology, environmental biology and molecular biology for qualitatively assessing or quantitatively measuring the presence, amount, or functional activity of a target entity. An assay is a laboratory procedure or test that is performed to determine the presence, concentration, quality, or biological activity of a specific substance or component within a sample.