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Test ID: GAST    
Gastrin, Serum

Method Description Describes how the test is performed and provides a method-specific reference

The Immulite 2000 Gastrin is a chemiluminescent, enzyme-labeled immunometric assay based on a ligand-labeled murine monoclonal capture antibody specific for gastrin and separation by antiligand-coated solid phase. The patient sample along with the ligand-labeled, antigastrin monoclonal antibody, an alkaline phosphatase-conjugated rabbit polyclonal antigastrin antibody and an alkaline phosphatase-conjugated murine monoclonal antigastrin antibody are simultaneously incubated in the presence of the immobilized antiligand bead in a reaction tube. During the 60-minute incubation, gastrin molecules in the sample form antibody sandwich complexes that, in turn, bind to antiligand on the solid phase. Unbound conjugate is then removed by a centrifugal wash, after which luminogenic substrate is added and the reaction tube is incubated for an additional 5 minutes. The chemiluminescent substrate, a phosphate ester of adamantyl dioxetane, undergoes hydrolysis in the presence of alkaline phosphatase to yield an unstable intermediate. The continuous production of this intermediate results in the sustained emission of light. The bound complex and, thus, also the photon output, as measured by the luminometer is proportional to the concentration of gastrin in the sample. (Immulite 2000 Gastrin. Siemens Medical Solutions Diagnostics, 5210 Pacific Concourse Drive, Los Angeles, CA 900455-6900. PIL2KGA-15, 2008-11-14)

Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.

Monday through Friday; 5 a.m.-12 a.m., Saturday; 6 a.m.-6 p.m.

Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.

Same day/1 day

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result

3 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

3 months

Performing Laboratory Location The location of the laboratory that performs the test

Rochester