Skip to content

Chlamydia Antibody Test (Conjunctival Fluid)

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

This test detects antibodies in your conjunctival fluid that your immune system produces in response to *Chlamydia trachomatis*, a bacterial infection that can affect the eyes and surrounding tissues. It helps diagnose conjunctivitis or other eye infections caused by this bacterium.

Quick summary

["This test helps identify if you’ve been exposed to chlamydia in the eye area, even if you don’t have obvious symptoms."]

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

Key facts at a glance

LOINC
6343-8
Short code
CHLMAG
Synonyms
Chlamydia Ag Conjunct Ql IA
Category
chemistry
Sample
serum
Container
Sterile viral transport medium (VTM), sterile screw-cap container, or Chlamydia-specific transport medium; Dacron or rayon-tipped swab with plastic shaft
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
≥ 0 years
Method
Immunoassay (Enzyme Immunoassay/EIA) for direct detection of Chlamydia species antigen
CPT
87810
SNOMED
314529007
Specimen volume
Minimum 0.5 mL of transport medium containing conjunctival swab specimen; adequate cellular material from conjunctival scraping preferred
Stability
Refrigerated (2-8°C): up to 24-48 hours. Frozen (-70°C or below): up to 1 month. Avoid repeated freeze-thaw cycles. Transport to laboratory on wet ice or refrigerated within 2 hours of collection.
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–48 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like redness, discharge, or discomfort in your eyes, or if you’ve been exposed to someone with a chlamydia eye infection. It’s also used in certain screening or follow-up situations, such as after eye trauma or in high-risk groups.

What to Expect Before the Test

No special preparation is needed. You’ll likely be asked to gently collect a small sample from your conjunctiva (the inner lining of your eyelid) using a sterile swab. This is usually done in a doctor’s office or clinic.

What Happens During the Test

The sample is tested for the presence of antibodies against *Chlamydia trachomatis*. The test uses an immunoassay method to detect these antibodies, which your body produces in response to infection. Results are typically available within a few days.

What the Results Mean

A positive result means your body has detected antibodies to chlamydia, suggesting past or current infection. A negative result means no detectable antibodies were found at the time of testing. Follow-up testing or treatment may be recommended based on your clinical situation.

Reference range

Negative (No Chlamydia species antigen detected). Positive indicates presence of Chlamydia sp antigen in conjunctival specimen.N/A

Specimen: serum

No fasting required. Patient should avoid topical application of eye medications (antibiotics, anesthetics, or artificial tears) for at least 1-2 hours prior to specimen collection. Inform clinician of any recent antibiotic therapy as it may reduce antigen detection sensitivity.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Chlamydia IgG/IgA Antibody (Conjunctiva)

Frequently asked questions

How long does it take to get results from this test?
Results are usually available within 2 to 5 business days, depending on your lab’s processing schedule. Your healthcare provider will contact you once they have the results.
Can I take antibiotics before getting this test?
Yes, if you’re prescribed antibiotics for a suspected chlamydia eye infection, you should take them before testing. However, if you’re unsure or have symptoms, consult your doctor before starting antibiotics to avoid interfering with the test results.
Is this test different from a urine chlamydia test?
Yes, this test specifically examines conjunctival fluid for chlamydia antibodies, while a urine test looks for the bacterium itself or its genetic material. The conjunctival test is used when eye symptoms or exposure to eye infections are suspected, whereas urine tests are typically used for general chlamydia screening in other body sites.
  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