A member asked:

Is an rpr conclusive at 200 days post exposure? result is non-reactive

A doctor has provided 1 answer
Dr. Jay Park answered

Not definite: There are unusual exceptions, i.e., RPR could be falsely negative in latent acquired syphilis of long duration. Individual with high antibody concentration may test falsely negative, known as prozone phenomenon.

Answered 3/13/2019

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