Chlamydia Antibody Test (Serum or Plasma) – Qualitative Immunoassay

Why This Test Is Done

Your healthcare provider may recommend this test if you have risk factors for chlamydia, such as unprotected sex, multiple sexual partners, or symptoms like unusual discharge, pain during urination, or pelvic pain. It’s also sometimes included in routine sexually transmitted infection (STI) screening, especially for sexually active individuals.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (usually from your arm) in a clinic or lab. The test is quick and typically done in a few minutes. If you’re tested for chlamydia via urine, you may be asked to collect a midstream urine sample at home or in a clinic.

What the Test Results Mean

A positive result means your body has produced antibodies against chlamydia, suggesting past or current infection. A negative result means no detectable antibodies were found, but this doesn’t always rule out infection—other tests (like nucleic acid amplification) may be needed for confirmation.

What to Do If You Get a Positive Result

If your test is positive, follow your healthcare provider’s instructions for treatment (usually antibiotics like azithromycin or doxycycline). Both you and your sexual partners should be tested and treated to prevent reinfection or spreading the infection. Report your result to your partners to ensure they get tested and treated if needed.