Quantitative Test (Titration) Titer Undiluted Reactive 1:4 1:2 Reactive 1:4 1:4 1:8 1:16 Reactive Nonreactive Nonreactive INTERPRETATION OF RESULTS Flocculation of RPR Antigen which appears as black clumps against the white background of the card indicates a Reactive (R) specimen. Slight but...
When the quantitative RPR card test is performed on patients with syphilis, a fourfold rise in titer in a repeat specimen may suggest an infection, a reinfection, or a treatment failure; a fourfold decrease in titer following treatment for early syphilis usually indicates that therapy was adequate...