Chlamydia antibody test
Quick answer: This blood test measures antibodies against Chlamydia, a bacterium that can infect the genital tract or lungs. Doctors may order IgG as part of an infertility work-up to estimate the chance of tubal damage from a past infection.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
- In fertility carePast chlamydia infection can block or damage the fallopian tubes, so a positive IgG may lead your doctor to check your tubes with an HSG or laparoscopy.
How the test is done
- 1A nurse confirms the fertility doctor's request
- 2A vein on your arm is cleaned
- 3A needle collects a tube of blood
- 4The lab measures chlamydia IgG antibodies in your serum
What your results can mean
Reading your report
A blood antibody test cannot diagnose a current genital infection, which needs a swab or urine test, so discuss your result with your doctor.
If the result is outside the usual range
A positive IgG can show a past chlamydia infection and a higher chance of tubal damage. A negative result makes tubal damage from chlamydia less likely but does not rule out blocked tubes from other causes.
Who usually has this test
Women having a fertility work-up, to help decide how soon tube testing such as HSG or laparoscopy is needed.
Risks and aftercare
No special aftercare; a current infection needs a swab or urine test, not this blood test.
Names and options
Also called: chlamydia IgG, chlamydia IgM, chlamydia IgA, CAT test
Options
- IgA
- IgG
- IgM
Listed by the hospital as
- CHLAMYDIA IGA ANTIBODY
- CHLAMYDIA IGG ANTIBODY
- CHLAMYDIA IGM ANTIBODY
Questions about this test
Does a positive chlamydia IgG mean my tubes are blocked?
No. It shows past exposure and a higher chance of tubal damage, but many people with antibodies have open tubes. Your doctor may suggest a tube test such as HSG to check.
Can chlamydia cause infertility without symptoms?
Yes. Chlamydia often causes no symptoms, but it can inflame and scar the fallopian tubes. This is why it is sometimes called a silent cause of tubal infertility.
Should my partner be tested if my chlamydia antibody is positive?
A positive blood antibody shows past exposure, not current infection. If a current infection is suspected, both partners are usually tested with urine or swab tests and treated together.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
Reception
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.