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Test Name:
Rickettsia rickettsii IgG and IgM Antibodies, by IFA
- SBMF No:
44410 - Performance Lab Name:
ARUP Laboratories - Test Mnemonic:
RMSF G/M - ABN:
Not required - CPT Code:
86757x2 - LOINC Code:
5307-4; 5308-2 - Ref Lab Test No:
0050371 - Test Includes:
Rickettsia rickettsii IgG Antibody
Rickettsia rickettsii IgM Antibody - Also Known As:
Rocky Mountain Spotted Fever IgG and IgM Antibodies - Also See:
44233 Rickettsia rickettsii IgG Antibody, by IFA
44409 Rickettsia rickettsii IgM Antibody, by IFA - Spec Type:
Serum - Spec Container:
Gold top (SST) or red top (serum) tube - Pref Vol:
1.0 mL - Min Vol:
0.5 mL
Pediatric Collection: 0.3 mL - Fasting:
No - Spec Collect:
Routine venipuncture
Parallel testing is preferred
Label samples as: "acute" or "convalescent"
Convalescent samples must be received within 30 days from receipt of acute samples - Spec Process:
Clot 30 minutes
Promptly centrifuge 15 minutes
Immediately transfer serum to separate plastic tube - Spec Store Transport:
Refrigerated - Spec Stability:
After separation from cells:
48 hours room temperature (20-30°C)
2 weeks refrigerated (2-8°C)
1 year frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles - Spec Reject:
Severely lipemic, contaminated, or hemolyzed sample - Methodology:
Indirect Fluorescent Antibody (IFA) - Clinical Significance:
Refer to:
- Reference Range:
- Rickettsia rickettsii (Rocky Mountain Spotted Fever) Antibody, IgG
- Less than 1:64: Negative - No significant level of Rickettsia rickettsii IgG Antibody detected.
1:64 - 1:128: Low Positive - Presence of Rickettsia rickettsii IgG Antibody detected, suggestive of current or past infection.
1:256 or greater: Positive - Presence of Rickettsia rickettsii IgG Antibody suggestive of recent or current infection. - Rickettsia rickettsii (Rocky Mountain Spotted Fever) Antibody, IgM
- Less than 1:64: Negative - No significant level of Rickettsia rickettsii IgM Antibody detected.
1:64 or greater: Positive - Presence of Rickettsia rickettsii IgM Antibody detected, which may indicate a current or recent infection; however, low levels of IgM antibodies may occasionally persist for more than 12 months post-infection. - Interpretive Data:
- The best evidence for current infection is a significant change on two appropriately timed specimens, where both tests are done in the same laboratory at the same time.
The CDC does not use IgM results for routine diagnostic testing of Rocky Mountain Spotted Fever, as the response may not be specific for the agent (resulting in false positives) and the IgM response may be persistent from past infection.
- Day Run:
Mon-Fri - Time Reported:
2-6 days - Test Type:
INFECTIOUS ANTIBODY
