Doctor's Assessment Included
Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
Chlamydia IgG Test: What It Indicates
This blood test looks for IgG antibodies, which can indicate past or earlier exposure to chlamydia rather than a current acute infection. It is sometimes used when looking into fertility questions. It can add context to your wider health picture.
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
Because antibodies can remain after an earlier infection, this test may point to past exposure even when there are no current symptoms. This information is sometimes considered when looking into fertility questions. A doctor can help interpret what a result may mean for you.
When to Test
IgG antibodies develop over several weeks, so this test is not suitable for detecting a very recent infection. For a possible recent exposure, a PCR test is generally more appropriate. A doctor can help you decide which test and timing fit your situation.
Recommendations
Male
Negative result indicates no prior chlamydia exposure detected. Continue safe sexual practices.
Positive IgG indicates past chlamydia exposure. This does not necessarily mean active infection. Consult your healthcare provider for further evaluation.
Female
Negative result indicates no prior chlamydia exposure detected. Continue safe sexual practices.
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.