Physiology of Normal Labor and Delivery 10. Maternal Physiology and Prenatal Care 11. Clinical Genetics 12. Infectious Diseases and AIDS 13. Trimester Ultrasounds Roya Sohaey M.D. Assistant Professor Department of Radiology U of U College of Medicine Objectives Definitions Outline Take Home Points Objectives To review normal and abnormal early pregnancy events and how they can be seen with ultrasound.
Menstrual age refers to the first day of the last normal menstrual period preceding pregnancy.
Gestational age is based on age from conception and therefor usually lags menstrual age by 2 weeks. A full term pregnancy is 40 weeks long. Basic embryologic events are reviewed in Table 1. The first trimester of pregnancy is arguably the most exciting time in human development. However, the first trimester is also an emotion-charged time because this period is fraught with a high failure and complication rate.