Chlamydia trachomatis Antibody, Qualitative (Serum/Plasma) – Immunoassay

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like unusual discharge, pain during urination, or pelvic pain—especially if you’re sexually active. It’s also part of routine STI screening for sexually active individuals, especially those with multiple partners or recent exposure. Some providers may order it for asymptomatic partners of someone diagnosed with chlamydia.

How the Test Works

The test uses a blood sample (serum or plasma) to detect antibodies against *Chlamydia trachomatis*. If antibodies are present, it suggests your immune system has recognized the infection, though the infection itself may no longer be active. This is a screening test, not a direct test for live bacteria.

What to Expect Before the Test

No special preparation is needed. Bring your blood collection appointment confirmation if scheduled. If you’re pregnant, inform your provider before testing, as some STI screenings may be recommended during pregnancy.

What the Results Mean

A positive result means antibodies to chlamydia are detected, indicating past exposure. A negative result means no detectable antibodies at the time of testing. Results alone don’t confirm an active infection—additional testing (like a urine or cervical swab) may be needed for diagnosis.