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Test Name:
Rickettsia rickettsii IgG Antibody, by IFA
- SBMF No:
44233 - Performance Lab Name:
ARUP Laboratories - Test Mnemonic:
ROCKY AB G - ABN:
Not required - CPT Code:
86757 - LOINC Code:
5307-4 - Ref Lab Test No:
0050369 - Also Known As:
Rocky Mountain Spotted Fever IgG Antibody - Also See:
44410 Rickettsia rickettsii IgG & IgM Antibodies, 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: 0.15 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. - 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.
- Day Run:
Mon-Fri - Time Reported:
2-5 days - Test Type:
INFECTIOUS ANTIBODY
