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Rocky Mountain Spotted Fever (RMSF), IgG

CPT: 86757
Updated on 09/22/2020
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  • Rickettsia rickettsii
  • RMSF, IgG, Quantitative

Test Includes

Rocky Mountain spotted fever screen by EIA with titers by IFA (reflex at no charge)

Rocky Mountain spotted fever screen by EIA with titers by IFA (reflex at no charge)

Expected Turnaround Time

1 - 5 days

Related Documents

Specimen Requirements




0.4 mL

Minimum Volume

0.2 mL


Red-top tube or gel-barrier tube

Storage Instructions

Room temperature

Stability Requirements



Room temperature

14 days


14 days


14 days

Freeze/thaw cycles

Stable x3

Causes for Rejection

Lipemia; hemolysis; bacterial contamination

Test Details


Establish the diagnosis of infection due to Rickettsia in the spotted fever group


The antigen used in the test is group specific and not species specific. Interference has been reported with this assay in patients suffering from Ehrlichia infections and Lyme disease.


Enzyme immunoassay (EIA) with indirect fluorescent antibody (IFA) titer on positives

Reference Interval


If result is positive or equivocal, IFA titers will be performed at no additional charge. Reference interval for titer reflex:

• Negative: <1:64

• Positive: 1:64

• Recent/active: >1:64


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
016592 Rocky Mtn Spotted Fev, IgG, Qn 41476-3 016171 RMSF, IgG, EIA 41476-3
Reflex Table for RMSF, IgG, EIA
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 016174 RMSF, IgG, IFA 016174 RMSF, IgG, IFA 5307-4

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