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.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
What this test measures
This test detects antibodies produced by the immune system in response to Treponema pallidum, the bacterium that causes syphilis. Modern syphilis testing typically follows a reverse screening algorithm: the initial test is an automated treponemal assay that identifies antibodies specific to T. pallidum, followed by a nontreponemal confirmatory test if the screen is positive.
The two-step approach serves an important purpose. Treponemal antibodies, once produced, generally persist for life, even after successful treatment. Nontreponemal antibodies, by contrast, tend to decline after treatment and can help distinguish a current or recent infection from a previously treated one. Syphilis progresses through distinct stages (primary, secondary, latent, and tertiary) and can cause serious health complications if left untreated, but it responds well to antibiotic therapy, particularly when caught in early stages. Screening is especially important because early syphilis can produce mild or easily overlooked symptoms.
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
Results from the initial screening are reported as "Reactive" (positive) or "Nonreactive" (negative). A reactive screening result triggers automatic confirmatory testing to verify the finding, since certain medical conditions can occasionally produce false-positive results on the initial screen. The confirmatory step helps distinguish a true syphilis infection from other causes of antibody reactivity. Healthcare providers interpret the combination of screening and confirmatory results alongside clinical history to determine whether the result reflects an active infection, a past treated infection, or a false positive, and can discuss next steps including treatment options when appropriate.
| 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.
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Last reviewed: April 2026
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.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
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