Rocky Mountain Spotted Fever Serologies

Tube Top

Test ID   LAB1265
EPIC Order
CPT Code(s)   86757
Group/Individual Test   Group
Laboratory   Clinical Immunology
Tube Station   30
Specimen Routine: 3 mL blood/Serum Separator Tube/Gold Top
Availability Routine: See Important Comments.
Turnaround Time  

In season:  1-5 days

Off season:  1-7 days

Reference Range Normal: <1:64

Specimens submitted for RMSF testing are assayed by indirect fluorescent antibody (IFA) testing using an IgG conjugate.  IFA is considered the gold standard serologic test for RMSF.  Samples are screened at a 1:64 dilution and titered to the endpoint if positive. Results are reported as <1:64 or titered to the endpoint

Antibodies are typically not detected in the first 7 to 9 days after onset of symptoms. Thus a negative result during acute infection does not rule out RMSF. The most sensitive approach for laboratory diagnosis is to collect a convalescent sample at least 3 weeks after the acute sample.

Reviewed by jcarr on November 30, 2021

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514