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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

STD

Chlamydia IgG

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.

What It 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.

Why It 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.

When to Test

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.

Recommendations

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.

Female

If Low

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

If High

Positive IgG indicates past chlamydia exposure, which may be associated with fertility implications. Consult your healthcare provider for evaluation.

Lifestyle Tips

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.

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.