Assessment of Seminal Oxidative Stress

The oxidative stress (OS) paradigm, an imbalance instigated by an excess of reactive oxygen species (ROS) generation, superseding the scavenging capacity of the antioxidant defense system, has been identified as a foundational element in innumerable pathophysiological phenomena. This chapter delves into the salient role of OS in the pathogenesis of male infertility and highlights the potential role of seminal OS assessment in the management of infertile men. Under physiological homeostasis, ROS are instrumental in various cellular processes, from mediating signal transduction to facilitating sperm capacitation. Pathophysiological deviation, however, ensues when an unregulated ROS cascade exceeds antioxidant mechanisms, instigating OS. The consequent ramifications include male oxidative stress infertility, typified by lipid, protein, and nucleic acid oxidative damage. OS is known to cast a pathogenic shadow over seminal parameters, as evidenced by a demonstrable association between exacerbated OS and an amplified presence of seminal leucocytes and sperm DNA fragmentation, significantly undermining spermatozoal fertilizing potential. This reverberation of seminal OS poses substantial implications for assisted reproductive technologies (ARTs). This manifestation is observed as reduced fertilization rates and diminished embryo quality, thereby accentuating the significance of seminal OS assessment in male infertility and ART prognoses. The chapter also discusses the conventional and advanced diagnostic methodologies for ROS assessment in the male reproductive environment, encompassing chemiluminescence assays, flow cytometry, and oxidation–reduction potential assays. These diagnostic resources constitute an essential prerequisite for devising therapeutic strategies targeting OS attenuation, thereby paving the way for an era of augmented reproductive outcomes.