define drug assay
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Assay 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). Qualitative assay, i.e. assays which generally give just a pass or fail, or positive or negative or some such sort of only small number of qualitative gradation rather than an exact quantity.
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Assay sensitivity Assay sensitivity is a property of a clinical trial defined as the ability of a trial to distinguish an effective treatment from a less effective or ineffective intervention. Without assay sensitivity, a trial is not internally valid and is not capable of comparing the efficacy of two interventions.
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assay determination of the purity of a substance or the amount of any particular constituent of a mixture. 1  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.
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- Bioassay (commonly used shorthand for biological assay or assessment), or biological standardization is a type of scientific experiment. A bioassay involves the use of live animal or plant (in vivo) or tissue or cell (in vitro) to determine the biological activity of a substance, such as a hormone or drug.
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- Medical Definition of IMMUNOASSAY. : a technique or test (as the enzyme-linked immunosorbent assay) used to detect the presence or quantity of a substance (as a protein) based on its capacity to act as an antigen or antibody.— immunoassay transitive verb. — im·mu·no·as·say·able \-a-ˈsā-ə-bəl\ adjective.efinition of IMMUNOASSAY. : a technique or test used to detect the presence or quantity of a substance (as a protein) based on its capacity to act as an antigen. — im·mu·no·as·say·able \-a-ˈsā-ə-bəl\ adjective. ADVERTISEMENT. noun im·mu·no·as·say \ˌim-yə-nō-ˈas-ˌā, im-ˌyue-ˌyü-, -nō-a\. ˈsā
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- Drug testing looks for traces of drugs in the body using samples of urine, breath, hair, saliva, or sweat. Drug tests detect whether you are under the influence of alcohol or whether you have taken drugs recently. Drug tests use samples to look for very small amounts of drugs in the body. There are different types of drug tests, including breath, blood, hair, saliva and urine, which test for various drugs. Testing may be used by a range of organisations including: 1  Workplaces to check for past use of illicit drugs and blood alcohol concentration while working.
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- Engaging drug discovery. Determining whether a compound binds its intended target is a fundamental question in drug discovery, but assays for measuring target engagement in vivo can be indirect. A Swedish group has remedied the situation with a new assay and founded a biotech, Pelago, to optimize the technology. Amy Donner.
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Drug Testing â False Positives Drug Testing – False Positives. In drug testing, a false positive is defined as a drug free sample falsely being reported as showing positive for drugs. This can occur for a number of reasons including: improper laboratory procedure, mixing up samples, incorrect paperwork and passive inhalation. But the most common cause of drug testing false positives are cross reactants. A cross reactant is a substance which because of its similar chemical structure to a drug or its metabolite can cause a false positive result.
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Substance Test Our drug detection test line allows you to determine whether a substance is ecstasy, marijuana, cocaine/crack, or heroin. These tests are simple and easy to use. You can test a substance that you find or you can test any flat surface that was touched by the drug or the person who used the drug. Substance testing has been used by law enforcement and security agencies for many years and now is available for individuals to use at home, school or work. If you find a foreign or suspicious substance whether a powder, pill or even residue, you can test the substance to determine if it is an illegal drug. You can detect the presence of trace amounts of drug residues left on surfaces, such as, door knobs, counter tops, light switches, steering wheels, phones, etc.
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immunoassay Detection and assay of substances by serologic (immunologic) methods; in most applications substance in question serves as antigen, both in antibody production and in measurement of antibody by the test substance.
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- The test for Content Uniformit y is based on the assay of the individual content of drug substance(s) in a number of individual dosage units to determine whether the individual content is within the limits set. The Content Uniformity method may be applied in all cases.
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- Assay: An assay is an analysis done to determine: 1  The presence of a substance and the amount of that substance. 2  Thus, an assay may be done for example to determine the level of thyroid hormones in the blood of a person suspected of being hypothyroid (or hyperthyroid).3  The biological or pharmacological potency of a drug. Thus, an assay may be done for example to determine the level of thyroid hormones in the blood of a person suspected of being hypothyroid (or hyperthyroid). 2  The biological or pharmacological potency of a drug. 3  For example, an assay may be done of a vaccine to determine its potency.
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assay Definition of assay. 1  1 : examination and determination as to characteristics (such as weight, measure, or quality) 2  2 : analysis (as of an ore or drug) to determine the presence, absence, or quantity of one or more components; also : a test used in this analysis. 3  3 : a substance to be assayed; also : the tabulated result of assaying.
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assay determination of the purity of a substance or the amount or activity 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 in a biological system with those of a reference standard.
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Screening vs. Confirmatory Tests Screening vs. Confirmatory Tests. There are two main categories of urine drug testing -- screening and confirmatory. Screening tests are initial, qualitative drug tests conducted to identify classes of drugs present in the urine and typically are done using immunoassay.
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Therapeutic Drugs - Optimal Time to Draw Samples In This Section. Laboratory monitoring of therapeutic agents is an endeavor that requires a great amount of coordination between laboratory, nursing and pharmacy personnel. To adequately evaluate the appropriate dosage levels of many drugs, the collection and testing of specimens for trough and peak levels is necessary. The trough level is the lowest concentration in the patient's bloodstream, therefore, the specimen should be collected just prior to administration of the drug.
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- Assay. Assay. (Science: procedure) The determination of the amount of a particular constituent of a mixture or of the biological or pharmacological potency of a drug. Please contribute to this project, if you have more information about this term feel free to edit this page.This page was last modified on 3 October 2005, at 21:16.This page has been accessed 26,306 times.lease contribute to this project, if you have more information about this term feel free to edit this page. This page was last modified on 3 October 2005, at 21:16.This page has been accessed 26,306 times.
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- Main Navigation. This is a dip strip drug test that detects 5 different drugs at one time, a 5 panel drug test (5 drug assay). We also offer a wide range of multi panel drug tests that will test from 2 to 12 drugs. This is a dip strip drug test that detects one drug at a time, a single panel drug test (1 drug assay). Here, we show a cannabis drug test to test for marijuana (THC drug testing). OrAlert - Oral Saliva Drug Test. Above is a mouth swab drug test, sometimes referred to as the Spit Drug Test.
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DEFINITION of 'Assay' DEFINITION of 'Assay'. The process of analyzing a physical sample to determine its composition. In financial markets, the term assay usually refers to the chemical analysis of a mineral or ore sample to ascertain its content of precious metals or minerals, such as gold, copper, or uranium.he process of analyzing a physical sample to determine its composition. In financial markets, the term assay usually refers to the chemical analysis of a mineral or ore sample to ascertain its content of precious metals or minerals, such as gold, copper, or uranium.
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- This definition has the following implications: IDENTIFICATION: To ensure the identity of the target pathogen or analyte. ASSAY (Content or Potency) : To provide an exact result which allows an accurate statement on the content or potency of the target pathogen or analyte in a sample.
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immunoassay immunoassay. any of several methods for the quantitative determination of chemical substances, such as hormones, drugs, and specific proteins, that utilize the highly specific binding between an antigen or hapten and homologous antibodies, including radioimmunoassay, enzyme immunoassay, and fluoroimmunoassay.
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Bestselling Detox Prodcuts! Pass A Drug Test products actually alters the structure of your blood cells to truly detoxify your blood and urine. Employee drug testing programs often incorporate hair follicle drug testing into their plans because of the sheer accuracy of these tests.ven the slightest suspicion of teen drug use, and a drug test should be administered. Pass Any Drug Test offers the highest quality products on the market backed by years of clinical testing and development by highly certified cocaine blood test specialists.
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assay noun. 1  An assay is defined as the finding of how much metal is in an alloy. An example of an assay is a scientific look into the compilation of a substance that is believed to have gold in it. 2  Assay means something that is being evaluated or assessed, or is a declaration of the results of that test.
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- Hair Drug Tests. A hair follicle drug test is a forensic toxicology test that identifies if someone has ingested drugs in the past 5 to 90 days. The hair test detection period is far greater than a urine test, which typically detects drug and alcohol use for about a week.
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- A toxicity bioassay may be run as a screening test, where the toxicity of a sample is compared to that of a control water, or as a definitive test, where several portions of the sample are diluted with varying amounts of the control water and their results compared to the control water.
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Blog Article Dilute Specimens. Dilution is the process of reducing the concentration of drug or drug metabolites in the sample. If the amount of the natural substance creatinine in the urine is abnormally low, internal dilution may be the cause. Drug testing laboratories all routinely test samples to detect dilution.