Syphilis Blood Tests Explained: VDRL, RPR, TP-PA & FTA-ABS

最后更新： 2026年5月18日

梅毒是我办公室常见的一种性传播疾病。与梅毒感染的阶段有关，临床表现出从无痛性生殖器溃疡到手掌和足底皮疹的变化。验血是确诊肝炎的唯一方法每次验血都有利有弊. Most of patients more likely confusing on it, especially, when their test confirmed positive. And the other thing while they didn’t have a full explanation from physicians it will mislead them to seek out another second opinions or advices. In this topic, we will figure out about the difference type of the tests and how to use them wisely.

梅毒诊断的唯一方法是验血

非梅毒测试–将其称为梅毒可疑感染的“筛查测试”。通常，我们将此测试用作主要调查。优点是侦查人员对活动性梅毒感染的能力，该能力要么用于追踪治疗是否有效的可能性。

柬埔寨常见的非螺旋体梅毒检测

VDRL（性病研究实验室）
RPR（快速血浆反应素）

Treponemal tests – it would be named as a “Confirmation tests”. If anyone got positive test from VDRL or RPR, it must do the reconfirming diagnosis with treponemal tests. The pro of this test is, it was very accuracy but unfortunately, we don’t know that the syphilis is currently in the active stage or not, that is the weak point of it. Additionally, the treponemal test will always positive in whole your life even a completely cured were done. Therefore, we cannot rely on the tracing’s treatment outcome via the treponemal tests only. This is why the patient must be carefully and pay attention more on the explanation about this information.

柬埔寨常见的梅毒螺旋体检测

TP-PA（脊髓灰质回生颗粒凝集）
FTA-ABS（吸收的荧光性色氨酸抗体）

对测试的良好理解可以带来最佳结果，并加强医患关系

Syphilis is a common disease that very easy to get treated, but the important thing is, how to make your treatment correctly and get educated your patient properly. When the patients educated and fully understanding about their problems and they can actually knowing how to trace the disease that currently they are in, then they will never and ever experience in the panic condition any more. So the point is, you need probably binding a good communication and relations a little stronger than before in order to get a high success treatment and cure on this kind of disease – syphilis. Have a good day.

如有任何疑问，您可以随时与我们讨论我.

If you have concerns about syphilis blood test results or need diagnosis and treatment for a sexually transmitted infection, Dr. Soarawee Weerasopone offers confidential specialist consultations at Bangkok Hospital Headquarters. 预约咨询.

Frequently Asked Questions about Syphilis Blood Tests

What is the difference between nontreponemal and treponemal syphilis tests?

Nontreponemal tests (VDRL, RPR) are used as screening tests to detect active syphilis infection and to monitor treatment response. Treponemal tests (TP-PA, FTA-ABS) are confirmation tests that are highly specific for syphilis but remain positive for life even after successful treatment, so they cannot be used alone to assess treatment outcome.

If my VDRL or RPR is positive, does it mean I have syphilis?

A positive VDRL or RPR is a strong indicator but not a definitive diagnosis. These screening tests can occasionally produce false positives due to other conditions such as autoimmune diseases or viral infections. A confirmatory treponemal test (TP-PA or FTA-ABS) is always required to make a definitive diagnosis of syphilis.

Why does my treponemal test stay positive even after treatment?

Treponemal tests detect specific antibodies against the syphilis bacterium that persist in the bloodstream for life once produced, even after the infection has been completely cured. This is a normal finding and does not mean the infection is still active. Treatment success is monitored using nontreponemal tests (VDRL or RPR), which should show a declining titer after effective treatment.

How do doctors know if syphilis treatment is working?

Treatment response is tracked by monitoring the VDRL or RPR titer over time. After successful treatment, the nontreponemal titer should decrease fourfold or more within 6–12 months. A stable or rising titer may indicate treatment failure or reinfection, requiring further evaluation by a specialist.

Is syphilis curable?

Yes, syphilis is highly curable, especially when diagnosed and treated early. The standard treatment is penicillin G injection, with the dose and duration depending on the stage of infection. Early diagnosis, correct treatment, and regular follow-up blood tests are essential to ensure complete cure and prevent complications or transmission to partners.

**免责声明：** 本内容由曼谷医院总院的认证泌尿科医生 Soarawee Weerasopone 医生撰写和审阅。本内容仅用于教育目的，不构成医疗建议。在开始任何医疗治疗前，请务必咨询合格的医疗专业人士。.

医学撰写与审阅： 素瓦瑞·维拉宋蓬医生（Pom医生）— 曼谷医院总部认证泌尿科医生。国际学者：贝勒医学院（美国）· 顺天堂大学（日本）· 长庚纪念医院（台湾）。.