Chlamydia Trachomatis IgG Antibody Test
About Chlamydia Trachomatis IgG Antibody Test
| Field | Value |
|---|---|
| Also Known As | Chlamydia Serology Test, C. trachomatis IgG Antibody Test, Chlamydia Antibody Test (CAT), Anti-Chlamydia IgG |
| Sample Type | Venous blood (serum) |
| Fasting Required | No fasting needed |
| Report Time | 1 to 2 working days |
| Recommended For | Sexually active adults of all genders; women with fertility concerns |
| Price | Starting at ₹720 |
What Is a Chlamydia Trachomatis IgG Antibody Test?
The Chlamydia Trachomatis IgG Antibody test is a blood test that checks for IgG antibodies — proteins the immune system produces in response to infection with Chlamydia trachomatis bacteria. It helps identify past or ongoing exposure to this infection. Also called the Chlamydia Serology test, it is typically ordered when a doctor suspects a chlamydial infection or wants to investigate fertility-related concerns. A small sample of venous blood (serum) is used.
What Does a Chlamydia Trachomatis IgG Antibody Test Measure?
This test looks for one specific type of antibody in the blood. Here is what it evaluates:
| Parameter | What It Shows |
|---|---|
| Chlamydia trachomatis IgG antibodies | Indicates whether the immune system has responded to a C. trachomatis infection — either in the past or currently |
IgG antibodies typically appear within 2 to 4 weeks of exposure and can remain detectable in the blood for years, even after the infection has been treated successfully. A positive result reflects an immune response to the bacteria, not necessarily an active infection at the time of testing.
Why Is a Chlamydia Trachomatis IgG Antibody Test Done?
Doctors may recommend this test for several reasons, ranging from symptom evaluation to fertility assessment.
Common Symptoms That May Require This Test
- Painful or burning sensation during urination
- Unusual discharge from the vagina or penis
- Lower abdominal or pelvic pain
- Pain during sexual intercourse
- Bleeding between menstrual periods
- Testicular pain or swelling in men
Conditions This Test Can Help Detect
This test can support the diagnosis of several conditions related to untreated or past chlamydial infection:
- Pelvic inflammatory disease (PID) — infection of the female reproductive organs
- Salpingitis — inflammation of the fallopian tubes
- Endometritis — inflammation of the lining of the uterus
- Epididymitis — inflammation of the tube that carries sperm
- Reiter's syndrome, also known as reactive arthritis
- Tubal factor infertility — difficulty conceiving due to blocked or damaged fallopian tubes
- Ectopic pregnancy — a pregnancy that develops outside the womb, often linked to prior chlamydial damage
Chlamydia Trachomatis IgG Antibody Test for Fertility
The Chlamydia Serology test is sometimes used to screen women with unexplained infertility. IgG antibodies may indicate previous tubal damage caused by an undetected chlamydial infection, which can affect a woman's ability to conceive. It is one of the tools used in fertility evaluations.
How to Prepare and What to Expect
No special preparation is needed before this test, but a few practical steps will help ensure an accurate result.
Do You Need to Fast?
No, fasting is not required. You can eat and drink normally before going in for this test. If your doctor has ordered other tests alongside this one, check whether any of those require fasting.
Practical Tips Before Your Test
- Tell your doctor about any medications you are currently taking.
- Share your clinical history, including any symptoms and relevant risk factors.
- Inform the team if you are pregnant or planning a pregnancy.
- Wear a short-sleeved or loose-fitting top for easy access during the blood draw.
Step-by-Step Procedure
- A trained phlebotomist (blood draw specialist) will clean the inside of your elbow with an antiseptic wipe.
- A soft band (tourniquet) is tied around your upper arm to make the vein easier to locate.
- A thin needle is inserted into a vein, and a small amount of blood — typically 3 to 5 ml — is drawn.
- The blood is collected in a serum separator tube, and the needle is removed.
- A small cotton pad or bandage is placed on the site to stop any minor bleeding.
- The sample is sent to the laboratory, where serum is separated and analysed using ELISA or immunofluorescence techniques.
Factors That Can Affect Accuracy
Certain factors may influence the test result. These include:
- Recent antibiotic use, which may affect antibody levels
- Testing too soon after exposure (antibodies may not appear for 2 to 4 weeks)
- Co-infection with related bacteria, such as C. pneumoniae, which can cause cross-reactions
- A weakened immune system, which may delay or reduce antibody production
- Recent vaccinations or other active infections
Understanding Your Chlamydia Trachomatis IgG Antibody Test Results
Your results should always be reviewed alongside your symptoms and medical history. The table below shows general interpretation guidelines for common testing methods:
| Result | IFA Method (Titre) | ELISA Method (Index) | Interpretation |
|---|---|---|---|
| Negative | Less than 1:64 | Index less than 0.9 | No significant antibody detected |
| Borderline | 1:64 | Index 0.9 to 1.1 | Unclear — repeat testing may be needed |
| Positive | 1:64 or above | Index greater than 1.1 | Antibodies present — suggests past or current infection |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Some circumstances can alter how results should be read: During a first-time (primary) chlamydial infection, the early IgG response may cross-react with other Chlamydia species, making the result harder to interpret. IgG antibodies can persist in the body for several years after a successfully treated infection, so a positive result does not always point to a current active infection. Patients with a weakened immune system may show a delayed or reduced antibody response, which could lead to a falsely negative result.
How to Maintain Healthy Levels
These general wellness tips can reduce the risk of chlamydial infection:
- Use barrier protection, such as condoms, consistently during sexual activity.
- Maintain a mutually monogamous relationship and limit changes in sexual partners.
- Consider regular screening if you are sexually active, particularly with new partners.
Lupin Diagnostics Chlamydia Trachomatis IgG Antibody Test Price and Home Collection
The Chlamydia Trachomatis IgG Antibody test price starts at approximately ₹720, with home collection available across major Indian cities.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹720 |
| Hyderabad | ₹720 |
| Chennai | ₹720 |
| Bangalore | ₹720 |
| Kolkata | ₹720 |
| Pune | ₹720 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers home sample collection for the Chlamydia Serology test near me across cities in India, so you can get tested without visiting a centre. All samples are processed in NABL-accredited laboratories by experienced technologists. Your digital report is delivered securely via email or WhatsApp.
Frequently Asked Questions
This blood test detects IgG antibodies produced in response to a Chlamydia trachomatis infection. It is used to identify past or ongoing exposure to the bacteria and is commonly ordered when investigating pelvic infections, infertility, or symptoms such as abnormal discharge and pelvic pain.
No, the Chlamydia Trachomatis IgG Antibody test cannot confirm an active infection on its own. IgG antibodies can remain in the blood for years after a treated infection. If your doctor suspects a current infection, a nucleic acid amplification test (NAAT) is the preferred diagnostic method.
Antibody levels begin to decline after about six months following treatment, but they can remain detectable for three to six years. This is why a positive result needs careful interpretation by your doctor alongside your symptoms and history.
Annual testing is recommended for all sexually active women under 25. Older women at increased risk, men who have sex with men, individuals living with HIV, and anyone with symptoms of a pelvic or sexually transmitted infection should also consider testing.
Chlamydia trachomatis often causes no obvious symptoms, which means it can go unnoticed. Over time, an untreated infection can lead to pelvic inflammatory disease, tubal damage, infertility, and ectopic pregnancy. Early detection through screening helps prevent these outcomes.
Yes, pregnant women can have their blood drawn for this test safely. However, for screening an active infection during pregnancy, NAATs are the method recommended by clinicians, as they directly detect the bacteria and offer greater accuracy than antibody testing.
Chlamydia Trachomatis IgG Antibody Test
