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Chlamydia pneumoniae antibody, serum/plasma (IgG)

Published: August 9, 2026Updated: August 16, 2026

This test measures your immune system’s response to *Chlamydia pneumoniae*, a bacterium linked to respiratory infections and potential heart/lung complications. It helps assess past exposure or chronic infection.

Quick summary

["Checks for long-term exposure to a bacterium that may affect your lungs or heart."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
22996-3
Short code
C psittaci Ab Ser Ql IA
Synonyms
C psittaci Ab Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 This Test Measures

The test detects IgG antibodies specific to *Chlamydia pneumoniae*, a type of bacteria that can cause lung inflammation or chronic respiratory issues. Antibodies indicate your body has encountered the bacterium at some point, though active infection may not always be present.

Why It’s Ordered

Your doctor may recommend this test if you have symptoms like persistent cough, lung issues, or if you’ve been exposed to respiratory infections. It’s also used in certain heart conditions or when evaluating chronic lung diseases.

What to Expect Before the Test

No special preparation is needed. A blood sample is drawn from a vein, usually in your arm. The test uses serum or plasma, the liquid part of blood without or with clotting factors removed.

What the Results Mean

Positive results suggest past exposure to *Chlamydia pneumoniae*, but they don’t always mean you’re currently infected. Higher levels may indicate a stronger immune response. Always discuss results with your doctor.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG Antibody to Chlamydia pneumoniae

Frequently asked questions

Why was this test ordered?
Your doctor may have linked symptoms like chronic cough, heart conditions, or lung diseases to possible *Chlamydia pneumoniae* exposure. This test helps confirm past infection or assess risk factors.
What does a positive result mean?
A positive result means your body has produced antibodies to *Chlamydia pneumoniae*, but it doesn’t always mean you’re currently infected. It may indicate exposure years ago or chronic infection requiring further evaluation.
Can this test detect active infection?
No, this test only detects past exposure through antibodies. For active infection, additional tests (like PCR or culture) may be needed.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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