Chlamydia IgG Antibody Screening Test (Serum)
This test detects antibodies in your blood that your immune system produces in response to Chlamydia trachomatis, a common bacterial infection often spread through sexual contact.
["This screening helps identify past or current Chlamydia infections by checking for immune system activity against the bacteria."]
Key facts at a glance
- LOINC
- 24239-6
- Short code
- Chlamydia IgG sp2 Ser-aCnc
- Synonyms
- Chlamydia IgG sp2 Ser-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- 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
Why This Test Is Done
Doctors may order this test if you have symptoms like unusual discharge, pain during urination, or if you’re at higher risk for Chlamydia, such as having multiple sexual partners or a history of sexually transmitted infections. It’s also part of routine screening for sexually active individuals under certain guidelines.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm in a clinic or lab. The test is quick and typically done while you’re sitting or lying down.
What the Test Results Mean
Positive results suggest your body has produced antibodies against Chlamydia, indicating past or possible current infection. Negative results mean no detectable antibodies were found at this time, but Chlamydia could still be present without immune response.
What Happens Next
If the test is positive, your healthcare provider will likely recommend further testing (like a swab or urine test) to confirm the infection and guide treatment. Follow-up may include retesting after treatment to ensure it worked.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
IgG Antibody to Chlamydia (Serum)
Frequently asked questions
Early detection of Chlamydia is crucial because untreated infections can lead to serious health issues, including pelvic inflammatory disease, infertility, or chronic pelvic pain in women, and epididymitis or infertility in men. It’s also linked to increased risk of HIV transmission.
A positive result means your immune system has likely encountered Chlamydia before, but it doesn’t always mean you’re currently infected. You may need additional testing to confirm active infection and receive treatment if needed.
Yes, it’s possible. Antibody tests detect past exposure, not necessarily current infection. Chlamydia can be present without triggering an immune response, so other tests (like swabs or urine tests) may be needed for diagnosis.
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