After a home pregnancy test has turned positive and a blood test measuring levels of human chorionic gonadotropin HCG have confirmed pregnancy, the next proof of pregnancy requires an ultrasound. When you have your first ultrasound your doctor may talk about the presence or absence of the gestational sac. What exactly is the gestational sac? When can it first be detected on ultrasound? What does it mean if it is or is not there? What does it mean if a gestational sac is seen, but appears to be empty?
Obstetric ultrasonography , or prenatal ultrasound , 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 the uterus womb. 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 dating, 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. Performing an ultrasound at this early stage of pregnancy can more accurately confirm the timing of the pregnancy, and can also assess for multiple fetuses and major congenital abnormalities at an earlier stage. There is no difference, however, in perinatal death or poor outcomes for infants. Below are useful terms on ultrasound: . In normal state, each body tissue type, such as liver, spleen or kidney, has a unique echogenicity.
The Meaning of No Fetal Heartbeat on an Early Ultrasound
Error: This is required. Error: Not a valid value. A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date.
As it turns out, most women only need a couple of ultrasounds during pregnancy. Read on to learn more about these important prenatal exams. Pregnancy ultrasounds provide your doctor with plenty of valuable information.