Clinical Trial to Assess the Influence of Gestational Stage and Maternal Age on Arterial Stiffness of the Mother

The subjects will be investigated as outpatients. For each subject, 4 individual dates with a duration of approximately 30 minutes each are scheduled - at the end of the first trimenon, at the end of the second trimenon, 4 weeks prior to the calculated date of birth, and 6 weeks after the effective date of birth.