What Is the Role of Paired Rapid Plasma Reagin Testing (Simultaneous Testing of Acute and Convalescent Samples) in the Diagnosis of Repeat Syphilis and the Follow-up of Syphilis? Kenyon, Chris R.; Osbak, Kara Krista; Van Esbroek, Marjan; More Kenyon, Chris R.; Osbak, Kara Krista; Van Esbroek, Marjan; Lynen, Lutgarde; Crucitti, Tania Less Sexually Transmitted Diseases. 45(1):35-38, January 2018. Abstract Abstract In Brief In Brief Favorites PDF Get Content & Permissions Abstract: In Brief: A longitudinal study of clients with syphilis found that paired rapid plasma reagin testing (simultaneous testing of acute and convalescent samples) as opposed to individual rapid plasma reagin testing was not useful. There was no difference in the proportion classified as serofast at 6 or 12 months.