CRP and preterm premature rupture of the membranes: Ilhan et al. (21) studied the plasma concentration of interleukin-6, C-reactive protein and vitamins A, C, E and 8-isoprostane using ELISA (Enzyme-Linked Immunosorbent Assay) in a total of 72 pregnant women (1) with PPROM and a mean gestational age of 29.2 weeks (n=38) and (2) without PPROM and a mean gestational age of 30 weeks (n=34).