All reactive serum requiresserial dilutionto estimate antibody titer. The titre is reported as the reciprocal of the highest dilution, which shows a positive test result. When the quantitative RPR card test is performed on patients with syphilis, a fourfold rise in titer in a repeat specimen may...
Thus, the clinical implications of our findings for the interpretation of RPR titers as a test of cure warrant further study. Our study has several limitations. The longitudinal data were sparse (median 5 per pregnant patient and 2 per infant). The sample size was small, particularly for the...