Days Set Up
Tuesday, Thursday
Analytic Time

1 - 5 days

MiChart Code
Soft Order Code

Test Updated:


Febrile Agglutinins
Rickettsia rickettsii
Weil-Felix Agglutinins
Rickettsia typhi
Murine Typhus
Rocky Mountain Spotted Fever
Typhus Fever Group Antibody
Spotted Fever Group Antibody
Febrile Antibodies Panel replacement (Rickettsia)
Tick Borne Disease

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

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Test Overview

Test Methodology

Indirect Fluorescent Antibody (IFA)

Test Usage

Antigen-specific IgG and IgM titers allow rapid diagnosis of infection by organisms within either of the two major groups of Rickettsia. The spotted fever group includes R. rickettsia (Rocky Mountain Spotted Fever) and R. akari (Rickettsial pox). The typhus group includes R. typhi (endemic/maurine typhus) and R. prowazeki (epidemic typhus).

Reference Range

Screen: Not detected. Titer: <1:64
R. typhi IgG, R. typhi IgM

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

Collect specimen in red top or SST tube.

Collection Offsite

Collect blood in a red top or SST tube. Centrifuge, aliquot serum into plastic vial and refrigerate. EDTA (lavender top), heparinized (green top) or ACD (yellow top) plasma is also acceptable.

Yellow Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.5 mL serum

Billing Information

CPT Code
86757 x4
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.