Streptococcus pneumoniae IgG Antibodies, 23 Serotypes, Serum
Method Description Describes how the test is performed and provides a method-specific reference
IgG antibodies to Streptococcus pneumoniae serotypes are measured by microsphere photometry. Purified pneumococcal polysaccharides coupled covalently to polystyrene microspheres bind IgG antibodies in patients' sera during the first incubation. After incubation, the microspheres are washed and incubated with phycoerythrin-conjugated antihuman IgG antibody. The concentration of IgG antibodies to each polysaccharide is determined by comparison to dose-response curves calculated from serial dilutions of a serum pool from immunized adults with known concentrations of antibodies to each polysaccharide (secondary standard). The secondary standard is traceable to a standard reference preparation (FDA 89-SF) that contains known concentrations of IgG antibodies to 23 different Streptococcus pneumoniae serotypes. Dose-response curves prepared from serial dilutions of the secondary standard parallel the dose-response curves of the primary reference preparation for all polysaccharides.(Jacob GL, Homburger HA: Simultaneous Quantitative Measurement of IgG Antibodies to Streptococcus Pneumoniae Serotypes by Microsphere Photometry. Poster Presentation; AAAAI 60th Annual Meeting, March 19-23, 2004. San Francisco, CA. J Allergy Clin Immunol Vol 113, No 2, [Abstract 1049, pS288] 2004; Plikaytis BD, Holder PF, Pais LB, et al: Determination of parallelism and nonparallelism in bioassay dilution curves. J Clin Microbiol 1994;2441-2447; Plikaytis BD, Goldblatt D, Frasch CE, et al: An analytical model applied to a multicenter pneumococcal enzyme-linked immunosorbent assay study. J Clin Microbiol 2000;38:2043-2050)
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; 8 a.m.