Chlamydia IgG Antibody (Serum) – Qualitative Screening Test
This test detects the presence of antibodies in your blood that your immune system produces in response to the Chlamydia bacterium, often linked to past infections.
["Helps identify if you may have been exposed to Chlamydia in the past, even if symptoms were never present."]
Key facts at a glance
- LOINC
- 56910-3
- Short code
- Chlamydia IgG sp1 Ser IA-aCnc
- Synonyms
- Chlamydia IgG sp1 Ser IA-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- 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
What This Test Measures
The test looks for IgG antibodies, which are part of your immune system’s defense. These antibodies develop after your body has encountered Chlamydia, typically weeks to months after infection. This test is not used to diagnose an active infection but rather to screen for past exposure.
Why It’s Ordered
Healthcare providers may order this test if you have risk factors for Chlamydia (e.g., sexually transmitted infection history, multiple partners) or if you’re part of a screening program for sexually transmitted infections (STIs). It can also be used in certain research or surveillance contexts.
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 setting. The process takes a few minutes, and you can resume normal activities afterward.
What to Expect After the Test
Results are typically available within a few days to a week. If positive, further testing (like a culture or PCR) may be needed to confirm an active infection or determine treatment needs. If negative, it means no detectable IgG antibodies were found at the time of testing.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
IgG Antibody to Chlamydia (Serum)
Frequently asked questions
This test is primarily used for screening and surveillance, not for diagnosing current infections. A positive result suggests past exposure but does not indicate whether you had symptoms or if the infection was treated. It’s important to discuss results with your healthcare provider, who may recommend additional testing if needed.
A positive result indicates that your immune system has likely encountered Chlamydia in the past. This does not necessarily mean you currently have an infection, but it does suggest a history of exposure. Your healthcare provider will determine if further testing is needed to assess current health status.
Results are usually available within 5 to 7 business days, depending on your lab’s processing time. If you have urgent concerns, contact your healthcare provider for updates.
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