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Sexual Conditions Health Center

Syphilis - Exams and Tests

Diagnosis of syphilis includes a medical history and a physical exam. Your doctor may ask you questions such as:

  • Do you think you have been exposed to any sexually transmitted infections (STIs)?
  • What are your symptoms?
  • Do you have sores in your genital area or anywhere else on your body?
  • Do you or your partner engage in sexual behaviors that put you at risk, such as having sex without a condom or having more than one sex partner?
  • Have you had an STI in the past?

The physical exam may include:

  • A careful examination of the skin and mouth to look for any rash or other abnormalities.
  • For women, a pelvic exam to look for signs of syphilis. During the pelvic exam, your doctor will look for abnormal sores in the vagina or on the vulva, labia, rectal area, and inner thighs. These sores occur during the primary stage of syphilis.
  • For men, a genital exam to look for signs of syphilis.
  • For newborns, an examination of both the newborn and the mother for symptoms. The evaluation for congenital syphilis begins with a review of the mother's health and testing the mother for syphilis.

The diagnosis of syphilis is usually confirmed with one of several blood tests. This is especially true if no sores are present. If sores are present, a doctor may look at the fluid from one of the sores with a microscope to see whether syphilis bacteria are present (dark-field examination).

In the diagnosis of the primary and secondary stages of syphilis, lumbar puncture (spinal tap) is needed in some cases.

Additional testing should be done to find out if other sexually transmitted infections are present, especially:

The diagnosis of syphilis can be delayed or complicated because its symptoms are very similar to those of many other diseases and are sometimes not recognized. Syphilis has historically been called "the great imitator."

Early detection

Screening for syphilis is strongly recommended for pregnant women and for people who are at increased risk for the infection.

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WebMD Medical Reference from Healthwise

Last Updated: November 14, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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