Abdominal scanning is performed with a full maternal bladder, provides a wider field of view, and provides the greatest depth of view.
Vaginal scanning is best performed with the bladder empty, gives a much greater resolution with greater crispness of fine detail.
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 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 gestations (i.e. Additionally, the ISUOG recommends that pregnant women have obstetric ultrasounds between 11 weeks and 13 weeks 6 days gestational age in countries with resources to perform them.
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.
You do not need to have a full bladder, a moderately filled bladder is needed for a proper examination.
Fortunately, gestational sac, yolk sac and embryo are surrounded by hyperechoic (brighter) body tissues.
Ultrasound is an essential tool for evaluating your baby during pregnancy.
An abdominal ultrasound is a procedure where a technician slides a transducer that emits high-frequency sound waves, over the abdomen to project an image (sonogram) to a computer screen.
Your prenatal visits will probably be scheduled every month until 32 to 34 weeks.
After that, they will be every two weeks until 36 weeks, and then weekly until delivery.