Syphilis Test
A comprehensive blood test that detects antibodies to Treponema pallidum, the bacteria that causes syphilis, providing essential screening for this treatable sexually transmitted infection.
Select Lab Partner
What this test measures
This syphilis test detects antibodies produced by your immune system in response to Treponema pallidum, the bacteria that causes syphilis. The test uses a modern algorithmic approach that typically combines both treponemal and nontreponemal testing to provide comprehensive screening and confirmation.
The testing detects two types of antibodies: treponemal antibodies that are specific to Treponema pallidum, and nontreponemal antibodies (reagins) that react with phospholipid antigens similar to those in the bacteria's membranes. Modern laboratories typically use a reverse screening algorithm, starting with an automated treponemal test that detects specific antibodies to T. pallidum, followed by confirmatory testing if positive. This approach allows for accurate detection of both current infections and past treated infections, helping healthcare providers determine the appropriate next steps for your care.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals who have had unprotected sexual contact with someone whose syphilis status is unknown
- People experiencing unexplained symptoms such as painless sores on genitals, mouth, or rectum
- Those with unusual skin rashes, especially on palms of hands or soles of feet
- Individuals planning pregnancy or currently pregnant who want comprehensive STD screening
- People who have been diagnosed with another sexually transmitted infection
- Those seeking routine sexual health screening as part of preventive healthcare
- Individuals with multiple sexual partners who want regular STD monitoring
- People who prefer private, confidential testing without involving their regular healthcare provider
What to expect
Preparation
No special preparation is required. You do not need to fast, avoid medications, or make any dietary changes before this test.
Sample Type
A small blood sample is drawn from a vein in your arm using a standard needle and collection tube. The process is quick and performed by trained laboratory staff.
Collection
Visit any participating lab location during business hours. Bring a valid photo ID and your test requisition. The blood draw takes just a few minutes, and you can resume normal activities immediately afterward.
Turnaround
Results are typically available within 1-3 business days and will be securely delivered through your online patient portal with detailed reference ranges and explanations.
Understanding your results
Your syphilis test results will indicate whether antibodies to Treponema pallidum are detected in your blood. The laboratory uses a two-step testing process to ensure accuracy: an initial screening test followed by confirmatory testing if needed. Results are typically reported as 'Reactive' (positive) or 'Nonreactive' (negative) for the initial screening, with additional treponemal confirmation performed if the screen is positive. Because some conditions can cause false-positive results on screening tests, confirmatory treponemal testing helps distinguish true syphilis infection from other conditions.
| Population | Reference Range | Notes |
|---|---|---|
| All adults | Nonreactive | Normal result indicates no detectable antibodies to Treponema pallidum |
Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.
What does a “Low” result mean?
A nonreactive (negative) result indicates that no antibodies to Treponema pallidum were detected, suggesting you likely do not have syphilis. However, very early infections may not produce detectable antibodies yet, and testing too soon after exposure can result in a negative result even when infection is present. If you have symptoms or recent high-risk exposure, discussing repeat testing with a healthcare provider may be appropriate.
What does a “High” result mean?
A reactive (positive) result indicates that antibodies to Treponema pallidum have been detected, which means you either currently have a syphilis infection or have had a syphilis infection in the past that may have been treated. Treponemal antibodies typically remain detectable for life, even after successful treatment, so a positive result requires clinical correlation to determine if treatment is needed. Follow-up with a healthcare provider is essential for proper interpretation and to determine the stage of infection if present.
Privacy & confidentiality
Your syphilis test results are completely confidential and protected by HIPAA privacy laws. Results are delivered securely through an encrypted patient portal that only you can access. Your test results are not shared with employers, insurance companies, or family members without your explicit consent. All testing is conducted with the highest level of discretion and privacy protection.
Frequently asked questions
Related tests
Related conditions
CPT Code: 86592
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
Select Lab Partner
Not sure if this is the right test? Contact our care team for guidance.