A Negative RPR Serologic Test for Syphilis

Photograph of a negative RPR test for syphilis showing no clumping of carbon particles.

No clumping of the carbon particles indicates the person's serum does not contain 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