Syphilis Antibody
The Syphilis Antibody test screens for antibodies to Treponema pallidum, the bacterium that causes syphilis. It is used as an initial screening for syphilis infection.
Category: Infectious Disease
Also known as: syphilis antibody, rpr, vdrl, syphilis screen, treponema antibody, fta-abs, tp-pa, syphilis igg
Reference range: 0–1 S/CO (Source: ABIM)
Standard unit: S/CO
High values may indicate
A positive (reactive) result indicates current or past syphilis infection. Confirmatory testing is needed to distinguish active from treated infection.
Low values may indicate
A negative (non-reactive) result means no syphilis antibodies were detected, indicating no current or past infection.
Frequently asked questions
- What is a normal Syphilis Antibody level?
- A typical reference range for Syphilis Antibody is 0–1 S/CO (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Syphilis Antibody measured in?
- Syphilis Antibody is most commonly reported in S/CO. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Syphilis Antibody reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Syphilis Antibody over time?
- Yes. Upload results from any lab and BloodId charts your Syphilis Antibody over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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