Chlamydia Antibody, Qualitative (Serum/Plasma)
This test detects antibodies in your blood that may indicate past or current infection with *Chlamydia trachomatis*, a common sexually transmitted bacterium.
["Helps identify possible chlamydia exposure by checking for immune system response."]
Key facts at a glance
- LOINC
- 45114-6
- Short code
- Chlamydia Ag Urth Ql
- Synonyms
- Chlamydia Ag Urth Ql
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 87110
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
The test looks for antibodies produced by your immune system in response to *Chlamydia trachomatis*. Antibodies are proteins your body makes to fight infections. If you have had an infection, these antibodies may remain in your blood for some time. This test does not directly detect the bacteria itself but serves as an indirect marker of exposure.
Why It’s Ordered
Doctors may order this test if you have symptoms like unusual discharge, pain during urination, or pelvic pain in women, or if you have been exposed to chlamydia. It’s also used as part of routine screening for sexually transmitted infections (STIs) in certain populations.
What to Expect
A blood sample is taken from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause discomfort. The test is quick and typically done in a doctor’s office or lab. Results are usually available within a few days.
Possible Results and Next Steps
A positive result means your blood contains antibodies suggesting past or current chlamydia 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 symptoms and medical history.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Chlamydia infection can lead to serious health issues if untreated, including pelvic inflammatory disease (PID) in women, which can cause infertility. It can also cause complications in pregnancy. Early detection and treatment are crucial to prevent these complications and reduce the risk of spreading the infection to others.
Short name
Chlamydia Antibody (Qualitative)
Frequently asked questions
What does a positive result mean?
Can I get treated if my test is positive?
Is this test the same as a urine test for chlamydia?
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