Reference Interval:
| Test Number
| Components
| Reference Interval
| | 0050369 | Rickettsia rickettsii (Rocky Mountain Spotted Fever) Antibody, IgG
| Less than 1:64: Negative - No significant level of Rickettsia rickettsii Antibody, IgG detected.
1:64 - 1:128: Low Positive - Presence of Rickettsia rickettsii Antibody, IgG detected, suggestive of current or past infection.
1:256 or greater: Positive - Presence of Rickettsia rickettsii Antibody, IgG suggestive of recent or current infection.
| | 0050372 | Rickettsia rickettsii (Rocky Mountain Spotted Fever) Antibody, IgM
| Less than 1:64: Negative - No significant level of Rickettsia rickettsii Antibody, IgM detected.
1:64 or greater: Positive - Presence of Rickettsia rickettsii Antibody, IgM 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.
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| 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.
Please refer to Statement A in the Compliance Statements section in the front of the Laboratory Test Directory.
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| CPT Code(s): |
86757 RMSF IgG; 86757 RMSF IgM
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