Chlamydia IgG Antibody (Serum) – Immunoassay

Why This Test Is Done

Doctors may order this test if you have symptoms of a sexually transmitted infection (STI), like unusual discharge, pain during urination, or pelvic pain. It can also be used as part of routine screening for STIs in certain high-risk groups. This test does not confirm an active infection but can indicate if your body has been exposed to Chlamydia in the past.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm in a clinic or lab. The test is quick and typically done while you’re sitting or lying down. Avoid alcohol for 24 hours before your blood draw if instructed by your healthcare provider.

What the Test Results Mean

Positive results suggest your immune system has encountered Chlamydia at some point, meaning you may have had an infection earlier. Negative results mean no detectable antibodies were found, indicating no past exposure. However, a negative result does not rule out an active infection, so follow-up testing may be needed if you suspect you have symptoms.

Possible Side Effects or Risks

Minor side effects from blood drawing are rare but may include slight bruising, swelling, or discomfort at the injection site. Rarely, there may be a reaction to the needle. If you have a bleeding disorder or take blood-thinning medications, let your healthcare provider know before the test.