Ultrasound provides useful information about the uterus, ovaries and baby that enables appropriate antenatal care. Fetal size and heart rate are checked at all stages of pregnancy, as well as the maternal uterus, ovaries and cervix. Pregnancy ultrasound is a non-invasive painless examination to assess fetal growth, position and anatomy, and placental site, as well as the maternal uterus and ovaries. Ultrasound can detect many, but not all abnormalities. Demonstrating a fetal abnormality on ultrasound depends on many factors, including fetal age and position at the time of the ultrasound, and the size and type of abnormality.
There is very little preparation required for these exams. You should have some fluid in the bladder, and it is recommended to wear clothing that allows easy access to the entire abdominal region. Medicare provides a rebate for ultrasound during the first and second trimester, and when there is a clinical concern.