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Chlamydia Trachomatis Antibodies Blood Test, IgG, IgA, and IgM

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The Chlamydia Trachomatis Antibodies Blood Test, IgG, IgA, and IgM, detects specific antibodies and helps diagnose past or recent Chlamydia trachomatis infection.


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Test Code:


CPT Code(s):



Immunofluorescence Assay (IFA)




No special preparation is required.

Test Results:

4-5 business days. May take longer based on weather, holiday, or lab delays. At this time, the lab is currently experiencing delays, and there is no estimated timeframe for when results will be available.

Walk-In Lab is prohibited from selling Quest tests to residents in the following states:AZ, NY, NJ, RI

What is the purpose of this test?

The Chlamydia Trachomatis Antibodies Blood Test is a diagnostic tool used to detect the presence of antibodies to the Chlamydia trachomatis bacteria in the blood. This bacteria is responsible for causing one of the most common sexually transmitted infections (STIs) in the world. The test measures levels of IgG, IgA, and IgM antibodies in the blood, which the immune system produces in response to the infection caused by Chlamydia trachomatis. 

IgG antibodies are long-lasting and can provide immunity against future infections by the same bacteria. They can persist in the body for years after the initial infection. IgA and IgM, on the other hand, are short-lived and indicate a recent or ongoing infection. IgM antibodies are produced early in the course of an infection and can indicate an acute infection, while IgA antibodies are produced later in the course of the infection and can indicate a chronic infection.

The CT Antibodies Blood Test, along with other diagnostic tests, can aid in the diagnosis of Chlamydia trachomatis infections and monitor the effectiveness of treatment. The test can be particularly useful in cases where other diagnostic tests, such as nucleic acid amplification testing (NAAT), are not available or have yielded inconclusive results. 

It is important to note that the CT Antibodies Blood Test is not a substitute for other diagnostic tests, such as NAAT or culture testing, as it cannot detect the presence of the bacteria itself. It is also important to note that a positive result does not necessarily mean that the person is currently infected with Chlamydia trachomatis, as IgG antibodies can persist in the body for years after an infection has been cleared. A healthcare provider should interpret the test results in the context of the person's medical history and symptoms.

Benefits of the Chlamydia Trachomatis Antibodies Blood Test, IgG, IgA, and IgM:

  1. Detection of Past Infection: It can identify antibodies produced by the immune system in response to past or recent Chlamydia trachomatis infection, even if symptoms have resolved, aiding in retrospective diagnosis.
  2. Assessment of Immune Response: The test assesses the specific types of antibodies (IgG, IgA, and IgM) present, providing insight into the timing and nature of the immune response to the infection.
  3. Confirmation of Infection: Positive results can confirm Chlamydia trachomatis infection, guiding healthcare providers in appropriate treatment and management strategies.
  4. Screening: In some cases, antibody testing may be used as a screening tool, particularly in populations at higher risk of Chlamydia trachomatis infection, helping to identify asymptomatic carriers and prevent transmission.
  5. Monitoring Treatment Response: Antibody levels may be monitored over time to assess the effectiveness of treatment and determine if further intervention is necessary.
  6. Prevention of Complications: Early detection and treatment of Chlamydia trachomatis infection can help prevent complications such as pelvic inflammatory disease (PID), infertility, and adverse pregnancy outcomes.

When should I order a Chlamydia Trachomatis Antibodies Blood Test, IgG, IgA, and IgM?

You should consider ordering a Chlamydia Trachomatis Antibodies Blood Test, IgG, IgA, and IgM if you experience any of the following symptoms:

  • Painful urination
  • Abnormal discharge from the penis or vagina
  • Pain during sexual intercourse
  • Lower abdominal pain
  • Fever and fatigue
  • Swollen lymph nodes in the groin area

It's important to note that not everyone with chlamydia experiences symptoms, so it's recommended to get tested regularly if you're sexually active.

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