What is a common serological test for syphilis besides FTA-ABS?

The correct response, TPHA (Treponema pallidum hemagglutination assay), is indeed a common serological test used for diagnosing syphilis. This test detects antibodies against Treponema pallidum, the bacterium that causes syphilis, in a patient's serum. It is particularly valued because it is highly sensitive and can remain positive long after treatment, making it useful for screening as well as confirmation of syphilis infection.

In addition to the FTA-ABS (Fluorescent Treponemal Antibody Absorption) test, the TPHA helps provide a comprehensive understanding of a patient's serological status regarding syphilis. Both tests are part of the non-treponemal and treponemal testing methods for syphilis, reflecting the desired confirmatory testing approach used in clinical practice.

The other strategies indicated, such as HBV testing, HCV testing, and HIV testing, are relevant for different infections, but they are not used specifically for the detection of syphilis. Each of these tests addresses specific viral infections rather than the bacterial infection associated with syphilis, which is why they do not serve as alternatives to TPHA in diagnosing syphilis.