FTA-ABS test for syphilis
Quick answer: This blood test uses a fluorescent method to look for IgG antibodies against the bacterium that causes syphilis. Doctors usually order it to confirm syphilis when screening tests are reactive or unclear.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
- In fertility careSyphilis is screened for early in pregnancy and often before IVF, as treatment prevents it from passing to the baby.
How the test is done
- 1A nurse confirms the confirmatory test request
- 2A vein in your arm is cleaned
- 3A needle collects a tube of blood
- 4Your serum is checked against the syphilis bacterium under a fluorescence microscope
What your results can mean
Reading your report
It usually stays positive after treatment, so your doctor reads it with your VDRL or RPR result.
If the result is outside the usual range
A positive result confirms antibodies to the syphilis bacterium from a current or past infection. Occasional false positives can occur with lupus or in pregnancy.
Who usually has this test
People whose syphilis screening tests are reactive or give unclear or conflicting results.
Risks and aftercare
No special aftercare; a positive result is followed by a discussion of treatment and partner testing.
Names and options
Also called: FTA-ABS, FTA IgG, fluorescent treponemal antibody
Listed by the hospital as
- FTA-AB (IGG AB TO TREPONEMA), SERUM BY IFA
Questions about this test
When is FTA-ABS used instead of TPHA?
It is used when other syphilis tests give unclear or conflicting results. It is a different kind of treponemal test that can help settle the answer.
Can FTA-ABS tell if syphilis is active?
No. It usually stays positive after treatment, so activity is judged with a VDRL or RPR titre.
Can FTA-ABS be positive in early syphilis?
It often turns positive fairly early, sometimes before other tests. Your doctor reads it with your symptoms and other results.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
Reception
Waiting area
IVF lab
This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.