Chlamydia Antibody, Serum (Qualitative Fluorescence Immunoassay)
This test detects antibodies to *Chlamydia trachomatis*, a common bacterial infection that can affect the reproductive system, eyes, or respiratory tract. It helps identify past or current infections.
["This screening test checks for signs of chlamydia infection by detecting your immune system’s response to the bacteria."]
Key facts at a glance
- LOINC
- 45011-4
- Short code
- CHLCSF
- Synonyms
- Chlamydia Ab CSF IA-aCnc
- Category
- chemistry
- Sample
- csf
- Container
- Sterile CSF collection tubes (tube 1 for chemistry/serology), screw-cap cryovial for transport
- Units
- N/A
- Ref low
- 1
- Ref high
- 2
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- Immunoassay (Enzyme Immunoassay/EIA or Chemiluminescent Immunoassay/CLIA)
- CPT
- 86631
- SNOMED
- 313330009
- Specimen volume
- 0.5-1.0 mL of CSF
- Stability
- Room temperature: 2 hours; Refrigerated (2-8°C): 24 hours; Frozen (-20°C or below): 30 days. Avoid repeated freeze-thaw cycles.
- Hemolysis max
- 200
- TAT
- 24–72 hours
- Order
- routine
Why This Test Is Done
Doctors may order this test if you have symptoms like unusual discharge, pain during urination, or pelvic pain. It’s also recommended as part of routine screening for sexually active individuals, especially those with multiple partners or new partners. Some healthcare providers may also suggest it for asymptomatic partners of someone diagnosed with chlamydia.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample from a vein in your arm. The test is usually done in a lab setting and may take a few minutes. If you’re pregnant, discuss this test with your provider, as it’s generally safe.
What the Test Results Mean
A positive result means your body has produced antibodies against chlamydia, suggesting past or current infection. A negative result means no detectable antibodies were found at this time. Follow-up testing or treatment may be recommended based on your symptoms and test results.
Possible Side Effects
There are rarely side effects from a blood draw, but you might feel slight discomfort, bruising, or swelling at the injection site. If you experience excessive bleeding, pain, or signs of infection (like fever or redness), contact your healthcare provider.
Reference range
Negative: Antibody not detected. Equivocal: Borderline result, repeat testing recommended in 1-2 weeks. Positive: Antibody detected, suggestive of current or past Chlamydia species infection of the central nervous system.N/A
No special patient preparation required. Inform patient of lumbar puncture procedure risks including headache, bleeding, and infection. Obtain informed consent prior to CSF collection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Chlamydia Antibody Screen (FIA)
Frequently asked questions
What does a positive result indicate?
How often should I get this test?
Can I get this test at home?
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