Syphilis Treponemal Antibody Test (Most Recent Result)

What This Test Measures

The test looks for antibodies produced by your immune system in response to *Treponema pallidum*. These antibodies can appear after infection and may persist even after treatment. This test is often used as a follow-up after a non-reactive non-treponemal test (e.g., RPR) to confirm syphilis diagnosis or monitor treatment response.

Why It’s Done

Your healthcare provider may order this test if you have symptoms of syphilis (e.g., sores, rash, or neurological issues) or if you’ve been exposed to the infection. It’s also used during pregnancy to check for syphilis in expectant mothers.

Sample Collection and Preparation

A blood sample is typically drawn from a vein in your arm. The blood is sent to a lab for testing. This test is usually performed on serum or plasma.

Test Method and Limitations

This test uses an immunoassay (often a fluorescence or chemiluminescent method) to detect antibodies. While highly sensitive, it may not detect early infections (before antibodies develop) and may have false positives in rare cases (e.g., untreated HIV or other infections).