Place the following Syphilis tests in sequential order: 1) IgG antibodies, 2) FTA-ABS, 3) RPR

In order to effectively understand the sequential testing for syphilis, it's important to know the roles of each test involved.

First, IgG antibodies are typically detected through serological testing used to determine if a person has been exposed to the bacterium Treponema pallidum, which causes syphilis. The presence of these antibodies can indicate a past infection and is often one of the first tests performed when syphilis is suspected.

Following that, the RPR (Rapid Plasma Reagin) test is a non-treponemal test that is frequently used to screen for syphilis. It helps to identify active infections, but it can yield false positives due to various conditions, meaning it's necessary to follow up with more specific tests once a positive result is obtained.

Finally, the FTA-ABS (Fluorescent Treponemal Antibody Absorption) test is a treponemal test that confirms the presence of Treponema pallidum antibodies. This test is more specific for syphilis and is often used to confirm the diagnosis after a positive non-treponemal test like the RPR.

Thus, the correct sequence for testing syphilis is to first detect IgG antibodies, perform the