OverviewThis is a normal fetal ultrasound performed at 30 weeks gestation. In the middle of the screen, a clear outline of the spine and ribs is visible. The cross hair is between two ribs just above the spine.
Update Date 11/16/2014
Updated by: Cynthia D. White, MD, Fellow American College of Obstetricians and Gynecologists, Group Health Cooperative, Bellevue, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.