Us obstetric nuchal dating scan
is an ultrasound of your pelvis which produces an image of the foetus in the uterus. An image of the baby is produced by the reflection of those sound waves.
The images (sonogram) are displayed on a television screen.
The procedure is a standard part of prenatal care in many countries, as it can provide a variety of information about the health of the mother, the timing and progress of the pregnancy, and the health and development of the embryo or fetus.
The International Society of Ultrasound in Obstetrics and Gynecology (ISUOG) recommends that pregnant women have routine obstetric ultrasounds between 18 weeks' and 22 weeks' gestational age (the anatomy scan) in order to confirm pregnancy timing, to measure the fetus so that growth abnormalities can be recognized quickly later in pregnancy, and to assess for congenital malformations and multiple pregnancies (twins, etc).
These tests can definitively exclude or confirm the presence of a specific birth defect.In normal state, each body tissue type, such as liver, spleen or kidney, has a unique echogenicity.Fortunately, gestational sac, yolk sac and embryo are surrounded by hyperechoic (brighter) body tissues.Features include the forehead at 10 o'clock, the left ear toward the center at 7 o'clock and the right hand covering the eyes at .Obstetric ultrasonography is the use of medical ultrasonography in pregnancy, in which sound waves are used to create real-time visual images of the developing embryo or fetus in its mother's uterus (womb).