Test Catalog

Test ID: SFGP    
Spotted Fever Group Antibody, IgG and IgM, Serum

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

Substrate slides containing antigen wells for measuring antibodies to both groups of Rickettsia (spotted fever and typhus) are obtained from Focus Technologies Inc. The indirect immunofluorescence assay (IFA) is a 2-stage "sandwich" procedure. In the first stage, the patient serum is diluted in yolk sac diluent. The diluted serum is placed on the slide in contact with the substrate and incubated. Following incubation, the slide is washed in buffered saline, which removes unbound serum antibodies. In the second stage, each antigen well is overlaid with fluorescein-labeled antibody to human IgG or IgM. The slide is incubated allowing antigen-antibody complexes to react with the fluorescein-labeled antihuman IgG or IgM. After the slide is washed, dried, and mounted, it is examined using fluorescence microscopy. Positive reactions appear as rickettsial bodies exhibiting bright apple-green cytoplasmic fluorescence against a background of orange to red yolk sac matrix. Semiquantitative end point titers are obtained by testing serial dilutions of positive specimens.(Package insert: Rickettsia IFA IgM, Focus Technologies Inc, Cypress, CA, August 12, 2016)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


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; 9 a.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 Clinic 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

14 days

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