A Positive RPR Serologic
Test for Syphilis
![Photograph of a positive RPR test for syphilis showing clumping of carbon particles.](images/rprpos.jpg)
Clumping of the carbon particles indicates the person's serum contains nonspecific
antilipid (reagin) antibodies.
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Microbiology Laboratory Manual by Gary E. Kaiser, PhD, Professor of Microbiology
is licensed under a Creative Commons Attribution 4.0 International License.
Last updated: September, 2017