Chlamydia IgM Antibody (Serum/Plasma) – Qualitative Detection
This test measures the presence of IgM antibodies in your blood, which your immune system produces in response to an infection caused by *Chlamydia trachomatis*. IgM antibodies typically appear within weeks of infection and can help identify past or recent exposure.
["IgM antibodies may indicate an active or recent chlamydia infection, though they don’t always confirm current infection alone."]
Key facts at a glance
- LOINC
- 22185-3
- Short code
- Chlamydia IgM CSF-aCnc
- Synonyms
- Chlamydia IgM CSF-aCnc
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
What Does This Test Measure?
IgM antibodies are a type of immune protein (antibody) your body makes when it detects *Chlamydia*, a common bacterial sexually transmitted infection. These antibodies can appear in your blood shortly after infection and may persist for months or longer. This test uses an immunoassay method to detect these antibodies, but it does not measure the bacteria itself.
Why Might You Need This Test?
Your healthcare provider may order this test if you have symptoms like unusual discharge, pain during urination, or if you’ve been exposed to chlamydia. It’s also sometimes used as part of routine screening for sexually active individuals at higher risk.
What to Expect Before the Test
No special preparation is needed. You may have a blood draw from a vein in your arm. If you’re pregnant, inform your provider before testing.
What to Expect After the Test
Results are typically available within 1–3 business days. If positive, follow-up testing or treatment may be recommended. If negative, further evaluation might be needed if symptoms persist.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
IgM Antibody to Chlamydia (Screen/Confirm)
Frequently asked questions
IgM antibodies alone may not confirm a current infection, as they can also appear after treatment or from past exposure. A positive result suggests possible infection but requires clinical correlation with symptoms and possibly additional testing (e.g., nucleic acid amplification).
Can IgM antibodies stay in my system long after infection?
What if my test is positive for IgM antibodies?
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