Test ID: IGGS4
Immunoglobulin Subclass IgG4, Serum
Method Description 
Describes how the test is performed and provides a method-specific reference
The concentrations of IgG4-subclass protein in serum are measured by automated nephelometry and immune reagents that specifically react with IgG4. The intensity of light scattered by immune complexes of IgG4 and specific reagent antibodies is compared to standard curves plotted from the reactions of protein standards with the same reagent antibody.(Instruction Manual: Behring Nephelometer II. Dade Behring Inc, Newark, DE; Schauer U, Stemberg F, Rieger CHL, et al: IgG Subclass Concentration in Certified Reference Material 470 and Reference Values for Children and Adults Determined with The Binding Site Reagents. Clin Chem 2003;49[11]:1924-1929)
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 Saturday; Continuously until 3 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
2 days
Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded
7 days
Performing Laboratory Location The location of the laboratory that performs the test
Rochester
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