Semen Creatine and Creatine Kinase Activity as an Indicator of Sperm Quality.

Background: The role of creatine (Cr) and creatine kinase (CK) in sperm function remains unclear. The study aimed to assess Cr and CK in seminal plasma and test their association with sperm characteristics.

Methods: The study included 62 males with couple's infertility and 26 males who have already fathered children.