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Chlamydia IgG Antibody Test

The Chlamydia IgG antibody test detects antibodies produced in response to a past Chlamydia trachomatis infection. A positive result indicates prior exposure but cannot distinguish between an active and a previously cleared infection.

Doctor's Assessment Included

Reference Ranges

Expected result Negative

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Chlamydia IgG: what this test measures

This test measures IgG antibodies against Chlamydia trachomatis in your blood. IgG antibodies are produced by the immune system after exposure to the bacterium and can remain detectable long after the infection has been treated and resolved.

Because IgG antibodies persist in the body, a positive result reflects immune memory rather than current infection status. This test is therefore most useful for understanding past exposure history.

Chlamydia IgG: why this value matters

Understanding your chlamydia exposure history can provide valuable context for your sexual health. Past chlamydia infections, particularly when untreated, may be associated with complications such as pelvic inflammatory disease or fertility concerns.

This information can help your healthcare provider assess your overall reproductive health and recommend appropriate follow-up testing or care if needed.

Chlamydia IgG: when is testing worthwhile?

Testing may be considered when investigating unexplained fertility issues, evaluating a history of pelvic inflammatory disease, or assessing past STI exposure. It may also be helpful as part of a comprehensive sexual health evaluation.

Note that for detecting an active chlamydia infection, a PCR-based test is recommended rather than an antibody test.

Chlamydia IgG: what to do about an abnormal value

Male

If Low

Negative result indicates no prior chlamydia exposure detected. Continue safe sexual practices.

If High

Positive IgG indicates past chlamydia exposure. This does not necessarily mean active infection. Consult your healthcare provider for further evaluation.

Chlamydia IgG: lifestyle and this value

Practise consistent and correct condom use during sexual contact to reduce the risk of chlamydia and other sexually transmitted infections. Regular STI screening is recommended for sexually active individuals, particularly when changing partners.

Open communication with sexual partners about testing and sexual health supports informed decision-making. If you have had a past chlamydia infection, discuss follow-up care with your healthcare provider to address any potential long-term effects.

Chlamydia IgG: frequently asked questions

Does a positive Chlamydia IgG result mean I currently have chlamydia?

Not necessarily. A positive IgG result indicates that your immune system has encountered Chlamydia trachomatis at some point, but IgG antibodies can remain detectable long after the infection has cleared. A PCR test is needed to determine if you have an active infection.

Can Chlamydia IgG antibodies go away over time?

IgG antibodies may decrease over time but often remain detectable for years or even a lifetime after exposure. A positive result does not necessarily reflect recent infection. Consult your healthcare provider for proper interpretation.

Should my partner also be tested?

If you are concerned about a current infection, both you and your partner may benefit from PCR-based testing for active chlamydia. Open communication about sexual health and testing is an important part of responsible health management.

Test Products

This marker is included in the following test panels.

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Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy
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Chlamydia IgG

€49,-