PRDX2 and obstructive sleep apnea syndrome: In this study, S-S/S-S dimer but also S-S dimer and S-S/SO2/3 dimer correlated significantly and negatively with RDW and positively with PLT in nontreated OSA, suggesting that RBC and PLT homeostasis under OSA condition may turn up the peroxidase activity of PRDX2 in RBC.