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Chlamydia Trachomatis, IgG

Also referred as

Chlamydia Serology test

For men & women

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The Chlamydia Trachomatis, IgG test detects the presence of IgG antibodies against Chlamydia trachomatis, a bacterium responsible for causing sexually transmitted infections (STIs), including chlamydia. IgG antibodies are produced by the immune system and may indicate past or ongoing (chronic) Chlamydia trachomatis infection.

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Understanding Chlamydia Trachomatis, IgG

Chlamydia is a common STI that can occur in men and women of all age groups. A Chlamydia Trachomatis, IgG test helps in the detection and appropriate management of chlamydial infections thereby reducing the risk of complications, preventing transmission, and promoting sexual health.

The Chlamydia Trachomatis, IgG test may be advised as a part of routine screening or for individuals with symptoms suggestive of a Chlamydia trachomatis infection such as abnormal pain, vaginal/urethral discharge, a burning sensation when passing urine, or painful intercourse. This test may also be recommended for individuals at risk of STIs such as those with a history of unprotected sexual activity, sexually active individuals, individuals with multiple sexual partners, or those with a history of STIs.

Pregnant women may undergo this test as part of routine prenatal screening to identify past exposure to Chlamydia trachomatis and assess the risk of transmission of infection from the mother to the baby during delivery. Additionally, the Chlamydia Trachomatis, IgG test can also be used to monitor the effectiveness of antibiotic treatment, as well as to identify if an individual has been reinfected after successful recovery from a previous infection.

Usually, no special preparation is needed for this test. You may eat and drink as per your daily routine. However, it is preferred that you provide your clinical history before giving the sample. A positive test result indicates the presence of IgG antibodies to Chlamydia trachomatis, suggesting a previous or chronic infection. However, a positive test result should be confirmed with a follow-up test (DNA PCR) to diagnose the infection. A negative test result suggests no previous infection. However, sometimes, the results may be negative in the early stages of the infection when the level of antibodies is insufficient for detection.

Talk to your doctor about your specific test results. Narrate your complete medical history to help them correlate your clinical and laboratory findings. The test results will help the doctor to make informed decisions about your sexual health.

What does Chlamydia Trachomatis, IgG measure?

The Chlamydia Trachomatis, IgG test analyzes the levels of chlamydia antibodies IgG in the blood. The IgG antibody detection is a marker for a chlamydia-positive immune response, either for ongoing (chronic) or past infections. IgG antibodies against chlamydia trachomatis can be detected within 2-4 weeks after exposure and remain detectable even after the person has been treated successfully. However, abnormal results do not confirm an active infection, as IgG antibodies can persist even after successful treatment.

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FAQs related to Chlamydia Trachomatis, IgG

What is the Chlamydia Trachomatis, IgG test?

The Chlamydia Trachomatis, IgG test checks for the presence of IgG antibodies against Chlamydia trachomatis in the blood. These antibodies are produced by the immune system in response to a Chlamydia trachomatis infection and often indicate past or ongoing (chronic) infection.

When should I get the Chlamydia Trachomatis, IgG test?

You should consider the Chlamydia Trachomatis, IgG test if you have symptoms of a Chlamydia trachomatis infection, such as burning during passing urine, abnormal discharge, or lower abdominal pain. This test may also be recommended if you are at higher risk for Chlamydia trachomatis infection.

What time should I get the Chlamydia Trachomatis, IgG test done?

The Chlamydia Trachomatis, IgG test can be taken at any time during the day.

What factors can influence the results of the Chlamydia Trachomatis, IgG test?

Factors that may affect the results of the Chlamydia Trachomatis, IgG test include recent antibiotic use, other infections, recent vaccination, and the individual's immune status. The body may take 7 to 21 days to produce antibodies so sometimes tests may be false negative if done very early after exposure to an infection. IgG and IgM antibodies to C. trachomatis can be detected usually within 2-4 weeks after exposure but may take longer in immunocompromised people.

How does chlamydia infection affect a woman’s health?

Chlamydia infection can cause permanent damage to a woman’s reproductive system. This can make it difficult or impossible to get pregnant later. Chlamydia infection can also cause a potentially fatal ectopic pregnancy (pregnancy that occurs outside the womb).

How does chlamydia infection affect a man’s health?

In men, chlamydia infection is usually present with urinary tract infections or urethritis. The infection can spread to the testicles and epididymis (tubes that carry sperm from the testicles), causing them to become painful and swollen.

How does chlamydia infection affect the unborn or newborn baby?

If you are pregnant and have a chlamydia infection, you can pass on the infection to your baby during delivery. This can cause an eye infection or pneumonia in your baby.

Is there a cure for chlamydia infection?

Yes, the right treatment such as antibiotics can cure chlamydia infection, provided that it is detected early on and appropriate treatment is started as early as possible. It is also important that you take all of the prescribed medicines and follow your doctor’s advice.

Content created by

Dr. Swati Gupta (Anand)

MBBS, MD Lab Medicine

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Last Updated

12th Oct 2025