Obstetric (OB) ultrasound is a key imaging procedure used throughout pregnancy to monitor the health and development of the fetus. It provides real-time images that allow physicians to confirm pregnancy, determine gestational age, evaluate fetal growth, and check for structural abnormalities. OB ultrasound is also used to assess the placenta, amniotic fluid levels, and overall maternal health, making it an essential tool for ensuring the well-being of both mother and baby.