Hypertensive disorders complicating pregnancy are the most common medical complications of pregnancy and are a major cause of maternal and perinatal morbidity and mortality. Thorough ambulatory obstetric care is likely to achieve a risk reduction. The main topics of ambulatory obstetric care are early identification of typical signs of preeclampsia, detection of uteroplacental insufficiency, and their consequences, detailed information of the patient, and early admission to a specialised obstetric care unit or perinatal center. Early diagnosis, close medical supervision, and timely delivery are the keys of the treatment of preeclampsia.