OBSTETRIC
OBSTETRIC
Obstetric ultrasound uses sound waves to produce pictures of a baby (embryo or fetus) within a pregnant woman, as well as the mother’s uterus and ovaries. It does not use ionizing radiation, has no known harmful effects, and is the preferred method for monitoring pregnant women and their unborn babies. A Doppler ultrasound study – a technique that evaluates blood flow in the umbilical cord, fetus or placenta – may be part of this exam.
Diet
Eat normally
Preparation
Start by emptying the bladder 2 hours before appointment, then drink 32 ounces of water.
Timing
Finish drinking all 32 ounces ONE HOUR BEFORE your exam.
Restriction
Do not empty your bladder before your exam.
OBSTETRIC ULTRASOUND STUDIES
FIRST TRIMESTER:
SECOND TRIMESTER:
An ultrasound scan performed between 18 and 22 weeks gestation (also known as the second-trimester anatomy scan or the anomaly scan) is a routine examination in many countries that’s aimed primarily to assess fetal anatomy and detect any fetal anomalies. A two-dimensional grayscale ultrasound with a curvilinear transabdominal probe is routinely used to evaluate the fetal number, viability, gestational age, anatomical survey, placental location, amniotic fluid, and maternal pelvic organs.
THIRD TRIMESTER:
The third trimester is defined as the antenatal period between 28 and 42 weeks of gestation. The use of ultrasound in the third trimester of pregnancy serves a multitude of general and specialized purposes that include but are not limited to the determination of fetal number and presentation, assessment of growth disorders, and characterization of the placenta and amniotic fluid.
WHAT OBSTETRICAL ULTRASOUND CAN DETERMINE
- establish the presence of a living embryo/fetus
- estimate the age of the pregnancy
- diagnose congenital abnormalities of the fetus
- evaluate the position of the fetus
- evaluate the position of the placenta
- determine if there are multiple pregnancies
- determine the amount of amniotic fluid around the baby
- check for opening or shortening of the cervix
- assess fetal growth
- assess fetal well-being
