The fluorescent treponemal antibody absorption or FTA-ABS test is a blood test that is used to check for the presence of antibodies to Treponema pallidum bacteria. This bacteria causes syphilis, but this test is used after performing other tests for syphilis, such as venereal disease research laboratory (VDRL) and rapid plasma regain (RPR) tests. The fluorescent treponemal antibody absorption test is also used to test for other sexually transmitted infections or if pregnant.
All the answers published in this website are written by verified medical doctors, therapists and health experts. The Content has been moderated by iCliniq medical review team before publication. Post your medical clarifications on iCliniq by choosing the right specialty and get them answered. Your medical queries will be answered 24/7 by top doctors from iCliniq.
Query: Hello doctor, I recently took the VDLR test, which was reactive to 1:1 and non-reactive to 1:2. So I took the FTA-ABS test. The result was reactive for IgG and non-reactive for IgM. Every year I do the rapid blood tests (those that prick my finger to take a drop of blood), and they always come back ... Read Full »
Answer: Hello, Welcome to icliniq.com. I read your query and understand your concern. No, it would be best if you do not seek any treatment now. The serological tests showed no active disease as IgM is negative. IgG is positive because you got this infection before. It is recommended to have this test don... Read Full »
Query: Hello doctor, This is regarding a syphilis test RPR (Rapid Plasma Reagin) ratio. Read Full »
Query: Hello doctor, I have been having rashes on my hands, forearms, trunk, and feet for four weeks now. The rashes on my hands and feet have lesions. The rashes are not itchy, except for those with lesions. I also have a small wound (or sore) on my anus, which has been there for three weeks now. I believ... Read Full »
Answer: Hello, Welcome to icliniq.com. Prior to the onset of rashes did you observe any lesion or wound on your penis? Or sexual encounter with someone who had such? May I ask questions about your sexual history? How many sexual partners have you had? Male or female? Are you aware of your partner's promiscu... Read Full »
Query: Hello doctor, I recently did an fluorescent treponemal antibody absorption test (FTA-ABS) test for syphilis. It showed reactive with a titer 1:1. But after a week and a half, I took a venereal disease research laboratory (VDRL) test, and it was non-reactive. Now I am confused. The doctor was not so ... Read Full »
Answer: Hi, Welcome to icliniq.com. Thanks for writing in, and I understand your concern. If FTA-ABS (fluorescent treponemal antibody test absorption) test is positive, it will remain positive for lifetime. It suggests that you have been infected with syphilis. It could have been in the past or present. Ho... Read Full »
Query: Hi doctor, I have an sexually transmitted disease (STD) question and hope to have an STD specialist doctor to assist me. I had a sexual contact three years ago and only last month I went for (Venereal disease research laboratory (VDRL) nontreponemal test) and is negative. I have read online that aft... Read Full »
Answer: Hello, Welcome to icliniq.com. Yes, sometimes many years after an infection with Treponema pallidum, venereal disease research laboratory (VDRL) may turn negative. TPHA (Treponema pallidum hemagglutination) or FTA ABS (fluorescent treponemal antibody absorption test) would be confirmatory in that c... Read Full »