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  • analytes
  • Immunoassay is the method of choice for measuring analytes normally present at very low concentrations that cannot be determined accurately by other less expensive tests. (encyclopedia.com)
  • A rapid and easily performed sample preparation technique that allowed the parallel determination of both analytes in aliquots of the same sample was developed. (rsc.org)
  • Typically, each procedure includes the following steps: specimen collection, sample washing, digestion or extraction of the hair sample, Immunoassay screening, and confirmation or quantitation of the various analytes. (druglibrary.org)
  • separation
  • Electrophoresis (EP) is a technique for separation of ionic molecules (principally proteins) by the differential migration through a gel according to the size and ionic charge of the molecules in an electrical field. (specialtylabs.com)
  • These specific cellular components may then be separated from the other cells in the population which is being tested using magnetic separation techniques. (justia.com)
  • The mass spectrometer is one of the most powerful detectors for various separation techniques, and is used for the majority of the 'hyphenated' or 'coupled' techniques. (drugtimes.org)
  • Immunoassays that require separation of the bound Ab-Ag* complex are referred to as being heterogeneous immunoassays. (scribd.com)
  • reaction
  • Quantitative immunoassays are performed by measuring the signal produced by the indicator reaction. (encyclopedia.com)
  • Cough-syrup codeine will also give a positive reaction for the morphine (a metabolic product of heroin use) immunoassay and many antihistamines that are available over-the-counter may yield positive reactions for amphetamines. (doctorabel.us)
  • analytical
  • In general, the choice of analytical drug-testing technologies can be grouped into three major categories of general analytical techniques. (drugtimes.org)
  • concentrations
  • The site and technique for collecting the hair specimens are important because considerable differences in trace element and drug concentrations have been reported for hair samples collected from different sites (Chatt and Katz 1988, pp. 14-16). (druglibrary.org)
  • Analysis
  • These techniques, however, have not been completely accepted and usually manual analysis is also performed as a check or verification. (justia.com)
  • The hyphenated techniques are effective tools for confirmatory testing of presumptive positive results or for systematic analysis of generally unknown compounds. (drugtimes.org)
  • Next, attempts were undertaken to adapt the immunoassay for analysis in whole blood samples. (epfl.ch)
  • The detected fluorescence is used for sample analysis, characterization or imaging. (google.com)
  • preliminary
  • To date, the most common drug-testing practices are based on a two-tier approach of initial immunoassay screening followed by confirmatory testing of preliminary positive screen results. (drugtimes.org)
  • In one aspect of this invention, a histogram of the fluorescence decay is generated by determining a preliminary histogram of the shape and multiplying it by the ratio of the total number of events divided by the number of events comprising the preliminary histogram. (google.com)