Chlamydia pneumoniae IgG Antibody (Serum) – Immunoassay
This test measures the level of antibodies in your blood that your immune system produces in response to *Chlamydia pneumoniae*, a type of bacteria that can sometimes affect your lungs and heart.
["This test helps detect past or possible exposure to the bacteria, which may be linked to certain respiratory or cardiovascular conditions."]
Key facts at a glance
- LOINC
- 5081-5
- Short code
- C psittaci IgM Ser-aCnc
- Synonyms
- C psittaci IgM Ser-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- 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
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms like persistent cough, shortness of breath, or if you’ve been exposed to someone with a respiratory infection. It can also be used to investigate unexplained chronic lung issues or heart problems linked to long-term bacterial exposure.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test checks for antibodies that your body makes after encountering *Chlamydia pneumoniae*, which can linger even if the infection is no longer active.
What the Results Mean
A positive result suggests your immune system has likely encountered *Chlamydia pneumoniae* at some point, though it doesn’t always mean you had an active infection. A negative result means no detectable antibodies were found, indicating no prior exposure or current infection.
Possible Follow-Up Actions
If your results are positive, your provider may recommend further testing (like a chest X-ray or additional antibody tests) to assess potential long-term effects on your health. If symptoms persist, they might explore other causes or treatments for your condition.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Chlamydia pneumoniae is a bacterium that can sometimes cause chronic lung inflammation or heart issues, particularly in people with weakened immune systems or pre-existing conditions. Antibody testing helps identify past exposure, which may be relevant for diagnosing conditions like chronic bronchitis, pneumonia, or heart valve damage. However, it’s not a direct test for active infection and should be interpreted alongside clinical findings.
Short name
Chlamydia pneumoniae IgG Antibody
Frequently asked questions
Does this test check for an active infection?
Can I get this test if I’ve never had symptoms?
What if my 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