FTA-ABS

FTA-ABS Test

The FTA-ABS (Fluorescent Treponemal Antibody Absorption) test is a blood test used to detect antibodies against Treponema pallidum, the bacterium that causes syphilis. It is a treponemal test and is generally used as part of the laboratory evaluation of suspected syphilis.

The test may remain positive for a long period, often even after successful treatment. Therefore, a positive FTA-ABS result generally indicates current or previous exposure to syphilis but does not by itself determine whether the infection is currently active or whether treatment is required. It is usually interpreted along with clinical findings and non-treponemal tests such as VDRL or RPR.

This Test is Recommended for Individuals:

• Individuals with suspected syphilis infection
• People with symptoms suggestive of syphilis, such as unexplained genital or skin lesions
• Individuals with a positive or reactive RPR or VDRL screening result
• People being evaluated for a history of syphilis
• Individuals whose healthcare provider recommends confirmatory treponemal testing
• Pregnant women when syphilis screening or further evaluation is indicated
• Individuals being evaluated after a potential exposure to syphilis

FAQs

1. What does a positive FTA-ABS result mean?
A positive FTA-ABS result indicates that antibodies against Treponema pallidum have been detected. Because these antibodies can remain detectable after treatment, the result may indicate current or previous infection and must be interpreted with other test results and medical history.

2. Is FTA-ABS used to monitor syphilis treatment?
Generally, no. FTA-ABS is not preferred for monitoring treatment response because treponemal antibodies may remain positive for a long time. Tests such as RPR or VDRL are commonly used to monitor changes in antibody levels following treatment.

3. Is fasting required for the FTA-ABS test?
Usually, fasting is not required for this blood test. Follow any specific instructions given by your healthcare provider or diagnostic laboratory.