Doctor insights on:
Vdrl/Rpr Positive For Syphilis
Rapid plasma reagin (rpr) is a blood test that looks for non-specific antibodies that may indicate that the organism (treponema pallidum) that causes syphilis is present. The term "reagin" means that this test does not look for antibodies against the actual bacterium, but rather for antibodies against substances released by cells when they ...Read more
Possible: The elisa test can be affected by different infections, causing a false-positive result. After any positive elisa, a follow-up test is performed by a 'western blot' which takes longer to perform, but gives a more sensitive answer. If you or someone you know had a positive HIV by elisa, they absolutely need the follow-up testing (including a full std/sti work up). ...Read more
Can RPR test for syphilis give false negative?If syphilis is highly suspected should I retest for it ?
Prozone effect: False (-) in RPR syphilis testing occurs when there is a prozone effect. Why? It's because the concentration of syphilis antibodies is so high, it interferes with the antigen-antibody interactions that result in a (+) reaction. A false (-) result can also occur during primary syphilis since not enough time has passed to allow high enough antibody levels for a (+) reaction to occur. ...Read moreSee 1 more doctor answer
Maybe: But the fta or mhtp should be negative. ...Read more
Tested false positive ELISA HIV test last month. Negative ifa and western blot and naat. 2 negative oraquick all 1 1/2 year post exposure. Hiv?
Yes: There are 2 reasons for this kind of result: (1) a false positive, or (2) early infection before seroconversion. In someone at low risk for HIV without symptoms, another negative WB in 1 month means there's no infection. In someone at risk or with symptoms of acute infection, a viral load can be helpful. The new 4th generation antigen/antibody tests will eliminate this problem. ...Read more
Then it's not Lyme: Lyme disease can be tricky -and you want to make sure you see someone like an Infectious Diseases doctor who knows how to treat it. The diagnosis is actually based on clinical findings, and the lab testing is generally 'supportive'. Since you're Western blot is negative, then it's very unlikely you have Lyme. There are other diseases that could cause 'Lyme-like' symptoms -and good to get evaluated ...Read more
Misinformed?: Who told you that your hep c test was false? If you have no viral load that means you cleared an infection. Are you sure you are getting the right advice? ...Read more
Can negative test results be trusted for a prostitute with HIV antibody rapid test and HIV duo test?
Screening tests.: Vdrl (venerial disease research laboratory) tests against anti-cardiolipin antibodies and RPR (papid plasma reagin) tests against nonspecific antibodies suggestive of syphilis and are screening tests. Treponemal antibody tests, like fta-abs and mha-tp usually become positive two to five weeks after the initial infection. These are used to confirm syphilis and stay positive, even after therapy. ...Read moreSee 1 more doctor answer
A rare testing error: A false positive occurs when the test is wrong. The chlamydia tests in current use are accurate about 99% of the time. ...Read more
Uncommon: The current tests for chlamydia have an accuracy of over98%. ...Read more