Chlamydia Antibody Test by Fluid Sample (Screening)
This test detects antibodies to *Chlamydia trachomatis*, a common bacterial infection that can affect the reproductive system, eyes, or throat. Antibodies indicate past or current infection, but this test alone cannot confirm active infection.
["This screening helps identify possible exposure to chlamydia, which may require further testing or treatment."]
Key facts at a glance
- LOINC
- 109533-0
- Short code
- CHLAG
- Synonyms
- Chlamydia Ag Msmt Fld
- Category
- chemistry
- Sample
- serum
- Container
- Sterile, leak-proof container; serum separator tube (SST) or plain red-top tube for serum collection
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Enzyme immunoassay (EIA) for Chlamydia sp antigen detection
- CPT
- 87320
- SNOMED
- 108936001
- Specimen volume
- 1-2 mL of serum
- Stability
- Serum stable at 2-8°C for 7 days; for extended storage, freeze at -20°C or below for up to 30 days. Avoid repeated freeze-thaw cycles.
- Hemolysis max
- 100
- Lipemia max
- 100
- Icterus max
- 50
- TAT
- 24–72 hours
- Order
- routine
What This Test Measures
The test looks for antibodies produced by your immune system in response to *Chlamydia trachomatis*. These antibodies are found in bodily fluids, including vaginal secretions, cervical fluid, or other bodily fluids depending on the sample type. This is a screening test, not a direct detection of the bacteria itself.
Why It’s Done
Doctors may order this test if you have symptoms like unusual discharge, pain during urination, or if you’re at higher risk (e.g., sexually active, new partners, or history of STIs). It’s also part of routine screening for sexually active individuals.
Sample Collection and Process
A sample of bodily fluid (e.g., vaginal, cervical, or other fluid) is collected and tested for antibodies. Results are qualitative (positive/negative) and do not provide a specific count of antibodies.
What the Results Mean
A positive result suggests past or possible current infection, but it does not confirm active infection. A negative result means no detectable antibodies at the time of testing.
Reference range
Negative: No Chlamydia sp antigen detected. Positive: Chlamydia sp antigen detected, indicating active infection.N/A
No special preparation required. Patient should refrain from voiding for at least 1 hour prior to specimen collection when applicable. Inform clinician of current antibiotic therapy.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Chlamydia is a common sexually transmitted infection (STI) that can cause complications like pelvic inflammatory disease, infertility, or chronic pelvic pain if untreated. Early detection and treatment with antibiotics can prevent serious health issues. This screening helps identify individuals who may need further diagnostic testing or treatment.
Short name
Chlamydia Antibody Screen
Frequently asked questions
Can this test confirm a current infection?
How soon after exposure can I get accurate results?
Does this test require fasting or special preparation?
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 15, 2026. · Read our editorial policy