Antibody to *Mycoplasma pneumoniae* (IgG) – Serum
This test measures the level of antibodies your immune system produces in response to *Mycoplasma pneumoniae*, a common bacterial infection often linked to respiratory symptoms.
["Helps diagnose or monitor infections caused by *Mycoplasma pneumoniae* in your bloodstream."]
Key facts at a glance
- LOINC
- 104433-8
- Short code
- M leprae DNA Spec Ql NAA+probe
- Synonyms
- M leprae DNA Spec Ql NAA+probe
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What Does This Test Measure?
The test detects IgG antibodies, which are part of your immune system’s long-term response to *Mycoplasma pneumoniae*. These antibodies develop after your body has been exposed to the bacteria, often weeks or months after infection. This test is not used to diagnose an acute infection but can help confirm past exposure or assess immune response over time.
Why Might You Need This Test?
A healthcare provider may order this test if you have symptoms like persistent cough, fever, or other respiratory issues that suggest *Mycoplasma pneumoniae* infection, especially if other tests (like a throat culture) were negative. It may also be used in research or clinical studies involving immune responses to this bacterium.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample, typically drawn from a vein in your arm. The sample is sent to a lab for analysis, and results are usually available within a few days.
What to Expect After the Test
After the blood draw, you may experience mild bruising or soreness at the site, which usually goes away on its own. If you have any unusual symptoms or concerns, contact your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive IgG results indicate past exposure to *Mycoplasma pneumoniae*, meaning your body has mounted an immune response. This can be useful in diagnosing chronic or recurrent infections, evaluating immune function, or assessing exposure in research settings. However, IgG alone does not confirm an active infection—it only shows prior exposure. If you have symptoms suggestive of an active infection, additional testing may be needed.
Short name
IgG Anti-*Mycoplasma pneumoniae* (Serum)
Frequently asked questions
How long does it take to get results?
Can this test be used to diagnose a current infection?
What if my test results are positive but I don’t have symptoms?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy