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Chlamydia Antibody Test (Cerebrospinal Fluid)

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

This test measures antibodies in your cerebrospinal fluid (CSF) to help detect past or current infection by *Chlamydia trachomatis*, a bacterium that can cause serious neurological or eye infections.

Quick summary

["This test helps diagnose rare but serious infections linked to *Chlamydia* in the central nervous system."]

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

Key facts at a glance

LOINC
23967-3
Short code
CHLMCSPAB
Synonyms
Chlamydia Ab Titr CSF
Category
chemistry
Sample
csf
Container
Sterile, screw-cap, leak-proof CSF collection tube (tube 3 or 4 recommended for microbiology/serology to minimize blood contamination)
Units
N/A
Ref low
0
Ref high
1
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
Immunofluorescence Assay (IFA) or Enzyme Immunoassay (EIA) with titer reporting
CPT
86631
SNOMED
313311001
Specimen volume
1-2 mL of cerebrospinal fluid
Stability
Refrigerate at 2-8°C if testing within 48 hours; freeze at -20°C or below for longer storage. Avoid repeated freeze-thaw cycles.
Hemolysis max
200
TAT
48–120 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like severe headaches, neck stiffness, fever, or vision problems that could suggest a rare *Chlamydia*-related infection in the brain or spinal cord. It’s also used in research or specific clinical scenarios where CSF is collected for detailed diagnostic evaluation.

What to Expect Before the Test

You’ll receive a spinal tap (lumbar puncture) under sterile conditions. The procedure involves inserting a needle into your lower back to collect CSF. You may feel pressure or mild discomfort, but it’s usually brief. You’ll be asked to lie still afterward to prevent bleeding.

What the Test Results Mean

Positive results indicate the presence of *Chlamydia* antibodies in your CSF, suggesting a past infection or an active, rare neurological involvement. Negative results mean no detectable antibodies were found. Consult your doctor for interpretation, as results may vary based on clinical context.

Common Causes of False Results

False positives or negatives can occur due to prior infections, cross-reacting antibodies, or technical errors. Your doctor will weigh test results alongside your symptoms, medical history, and other tests to avoid misdiagnosis.

Reference range

Titer < 1:1 (Negative); Positive titers suggest intrathecal antibody production. Interpretation requires paired serum/CSF analysis and clinical correlation.N/A

Specimen: csf

No fasting required. Lumbar puncture performed under sterile conditions by qualified personnel. Informed consent must be obtained prior to procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Chlamydia Antibody CSF

Frequently asked questions

This test is primarily used in research or specialized clinical settings to investigate rare infections like *Chlamydia* meningitis or encephalitis. It’s not routinely ordered for general *Chlamydia* screening (which is typically done via urine or blood tests).
This test detects antibodies in your CSF, not the live bacteria itself. Antibody presence suggests prior exposure or infection, but it doesn’t confirm an active infection without additional clinical correlation.
Yes, the specimen is taken from your cerebrospinal fluid, collected during a lumbar puncture. The test analyzes fluid from your spinal canal, not blood or other body fluids.
No standard reference ranges are provided because this is a qualitative test measuring antibody presence rather than a quantitative analyte. Results are interpreted based on clinical context, not absolute values.
If you’re pregnant, have an open wound, or are on blood thinners, your doctor may adjust the procedure or test timing to minimize risks. Always discuss your medical history with your provider before testing.
This test is not typically covered by insurance for routine *Chlamydia* screening. Check with your insurance provider for specific coverage details, as it’s often reserved for research or specialized diagnostic purposes.
  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