Mycoplasma pneumoniae IgG Abs
Other names: M pneumoniae IgG Abs
Mycoplasma pneumoniae is a small bacterium transmitted via organism-containing droplets.
It is a cause of upper respiratory infection, pharyngitis, and tracheobronchitis, particularly in children, and has been associated with approximately 20% of cases of community-acquired pneumonia. Central nervous system and cardiac manifestations are probably the most frequent extrapulmonary complications of infections due to M pneumoniae. The disease is usually self-limited, although severe disease has been reported in immunocompromised patients.
Identification of M pneumoniae by culture-based methods is time consuming and insensitive. Serology-based assays for M pneumoniae have several drawbacks. The development of IgM antibodies takes approximately 1 week and the IgM response in adults may be variable or it may be decreased in immunosuppressed individuals. Confirmation of the disease is dependent on the observation of a 4-fold rise in IgG antibody titers between acute and convalescent specimens, several weeks following the initial onset of illness, providing clinical utility only for retrospective testing. Real-time PCR offers a rapid and sensitive option for detection of M pneumoniae DNA from clinical specimens allows for diagnosis of acute or current infection.
Interpretation:
|
IgG Result |
IgM Result |
Interpretation |
|
Positive |
Negative |
Results suggest past exposure. |
|
Positive
|
Reactive |
Prior exposure to M pneumoniae detected. Confirmatory testing for IgM to M pneumonia will be performed by an immunofluorescence assay. |
|
Equivocal |
||
|
Negative |
Negative |
No antibodies to M pneumoniae detected. Acute infection cannot be ruled out as antibody levels may be below the limit of detection. If clinically indicated, a second serum should be submitted in 14 to 21 days. |
|
Negative |
Reactive |
No prior exposure to Mycoplasma pneumoniae. Confirmatory testing for IgM to M pneumonia will be performed by an immunofluorescence assay.. |
|
Equivocal |
||
|
Equivocal |
Negative |
Recommend follow-up testing in 10 to 14 days if clinically indicated. |
|
Reactive |
Confirmatory testing for IgM to M pneumonia will be performed by an immunofluorescence assay. |
|
|
Equivocal |
What does it mean if your Mycoplasma pneumoniae IgG Abs result is too high?
A positive result indicates prior exposure to Mycoplasma. A single positive IgG result may be present in the absence of any clinical symptoms as specific IgG antibodies may remain elevated long after initial infection. Recent or acute infection can only be documented by a positive Mycoplasma IgM result and/or a significant increase in the IgG value between sera drawn two to four weeks apart. Specific IgM antibodies may persist for several months after infection or be absent during reinfection.
Possible interpretation:
|
IgG Result |
IgM Result |
Interpretation |
|
Positive |
Negative |
Results suggest past exposure. |
|
Positive
|
Reactive |
Prior exposure to M pneumoniae detected. Confirmatory testing for IgM to M pneumonia will be performed by an immunofluorescence assay. |
|
Equivocal |
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