Measuring Free Radicals in Human Sperm Cells Related to Microbiota and Lifestyle Factors

The semen will be collected to measure the free radical concentration in seminal plasma and sperm together with the diversity of microbiota. Both males with a normal semen analysis (SA) and abnormal SA according to the WHO guidelines (2010) will be included. Blood plasma will be collected to measure systemic radical concentration and all outcomes will be related to lifestyle factors and food intake acquired through hospital charts and routinely conducted questionnaires together with a food frequency Questionnaire (FFQ).