Obstetrical Scans

This is an ultrasound examination performed between 11 and 14 week’s gestation at Carnegie Imaging. A measurement of the clear space in the tissue at the back of the baby’s neck is obtained. The presence or absence of the fetal nasal bone is also documented (absent nasal bone may be associated with an increased risk for chromosomal abnormalities). These results are combined with your age and a special blood test to determine if your pregnancy is at increased risk for certain chromosomal abnormalities such as Down syndrome. This ultrasound can also detect some (not all) birth defects such as whether or not your baby is at an increased risk for heart abnormalities.

For more information refer to the links below:

• Carnegie Imaging’s Combined First & Second Trimester Screening Program
• Down Syndrome
• Maternal Screening for Birth Defects
• ACOG Practice Bulletin: New Guidelines for Down Syndrome Screening

Initial Anatomy:This ultrasound is most often performed between 14 and 16 weeks. Your baby’s anatomy is evaluated for possible birth defects. It is important to note that all birth defects cannot be identified while you are pregnant.

Follow-Up Anatomy: This ultrasound is most often performed between 20 and 22 weeks. Your baby’s anatomy is re-evaluated for possible birth defects due to the fact that some features of your baby’s anatomy can be better visualized at this point. Likewise, parts of the baby are still developing. It is important to note that all birth defects cannot be identified while you are pregnant.

This is an ultrasound examination which is most often performed in the first trimester (prior to 14 weeks gestation). It determines if the pregnancy is growing properly within your uterus. It also checks to make sure your ovaries are healthy. A first trimester Viability/Dating ultrasound is the best time to establish your due date.

A growth ultrasound is performed to determine an estimated weight for your baby. This exam may be ordered if the doctor feels that your baby may be larger or smaller than expected or if you have a medical condition necessitating that the doctor keep track of the baby’s weight. It is important to note that this weight is an “estimate” and actual birth weight and estimated fetal weight can differ.

This ultrasound examination is used to assess the health of your baby. Movement, tone, breathing efforts, and amniotic fluid volume are checked to help determine how well your baby is doing in your uterus. This test may be obtained if you aren’t feeling your baby move as often as you did previously or if you or the baby has a medical condition necessitating such evaluation.

A cervical length ultrasound measures the length or your cervix. You made need this test if you are having symptoms of preterm labor such as contractions or pressure or if you have a previous history of preterm labor and or preterm delivery.

Doppler studies are a special ultrasound of the maternal, placental, or fetal vessels. They are utilized to determine if your pregnancy is at risk for problems or to determine the health of your baby in utero. These tests are only obtained if you or the baby has a condition necessitating them.

Ultrasound may be used to identify the location of your placenta. Your doctor may order this test if you have a history of vaginal bleeding or if your placenta looks like it may be near your cervix.

For the most part, the ultrasound examinations for patients with twins, triplets, and high-order multiples are the same as for patients who are pregnant with one baby. Nonetheless, patients with multiples often undergo more ultrasounds due to the fact that they may need to be monitored for signs and symptoms of preterm labor and delivery as well as growth discordance among twins.

This is a special ultrasound of the baby’s heart. This test may be needed if you have a family history of congenital heart defects or if it is difficult to visualize all of the parts of the heart at the time of routine anatomical screening.

3D ultrasound may be utilized to better visualize certain anatomical parts of your baby. Likewise, it may be utilized if a birth defect is suspected.