What defines a post-term pregnancy?

A post-term pregnancy is defined as one that extends to 42 weeks of gestation or beyond. This classification is important in obstetrics because post-term pregnancies can pose risks to both the mother and the baby, including complications such as decreased amniotic fluid, placental insufficiency, and increased likelihood of cesarean delivery. Monitoring becomes crucial during this time to ensure both maternal and fetal well-being.

The other definitions do not align with the accepted medical guidelines for a post-term pregnancy. Gestations less than 37 weeks are classified as preterm, those between 37 and 41 weeks are considered term pregnancies, and the definition of more than 39 weeks does not account for the specific cutoff point of 42 weeks, which is the standard for identifying post-term pregnancies. Understanding these distinctions helps in managing pregnancies appropriately and ensuring safety during delivery.