Ultrasound (also called sonogram) is a prenatal test offered to ALL pregnant women. US is the gold standard for confirmation of clinical pregnancy. This test uses sound waves to show a picture of your baby in the womb. Most importantly, US helps your health care provider check on your baby’s health and development and offer professional guidance when and if need be.
Naturally, Ultrasound can be a special part of pregnancy, a joyous experience, because this is the first time you get to “see” your baby! Normally, depending on when it’s done and your baby’s position, you may be able to see his/her limbs (hands, legs and other body parts.) Also, during Ultrasound in the late first trimester, you may be able to tell if your baby’s a boy or a girl, so be sure to tell your provider if you don’t want to know!
Majority of women get an ultrasound in their second trimester at 18 to 20 weeks of pregnancy. However, some also get a first-trimester ultrasound (also called an early ultrasound) before 14 weeks of pregnancy. The decision on when you can get an US lies solely with your caregiver and it’s based on your current state of health and your previous experience/ history. So, be sure to dialogue/ talk to your provider about when an ultrasound is right for you.
So, what are some reasons for having an ultrasound?
The following are the major reasons why US is done:
- To confirm (make sure) you’re pregnant (Clinical Pregnancy confirmation). Without an US showing clearly the poles of ongoing pregnancy, the pregnancy is tentative
- To check your baby’s age and growth, which will help care giver figure out your due date.
- To check your baby’s heartbeat, muscle tone, movement and overall development
- To check to see if you’re having multiple pregnancies with twins, triplets or more
- To screen for birth defects, like spina bifida or heart defects. Screening means seeing if your baby is more likely than others to have a health condition; it doesn’t mean finding out for sure if your baby has the condition. After an ultrasound, your provider may want to do more tests, called diagnostic tests, to see for sure if your baby has a birth defect. Birth defects are health conditions that a baby has at birth. Birth defects change the shape or function of one or more parts of the body. They can cause problems in overall health, in how the body develops, or in how the body works.
- To help with other prenatal tests, like chorionic villus sampling
- To examine your ovaries and uterus (womb). Ovaries are where eggs are stored in your body.
- To check for pregnancy complications, including ectopic pregnancy, molar pregnancy and miscarriage.
What are the different kinds of ultrasound in Pregnancy?
There are various kinds of US. The type you get depends on what your provider is checking for and how far along you are in pregnancy. However, all ultrasounds use a tool called a transducer that uses sound waves to create pictures of your baby on a computer. The most common kinds of ultrasound in pregnancy are:
- Transabdominal ultrasound. This is the commonest. When you hear about ultrasound during pregnancy, it’s most likely this kind. You lay on your back on an exam table, and your provider covers your belly with a thin layer of gel. The gel helps the sound waves move more easily so you get a better picture. Then he moves the transducer across your belly. You may need to have a full bladder during the test because sound waves move more easily through liquid than through air. Ultrasound is painless, but having a full bladder may be uncomfortable. The ultrasound takes about 20 minutes.
- Transvaginal ultrasound. This kind of ultrasound is done through the vagina. You lay on your back on an exam table with your feet in stirrups (special position). Your provider moves a thin transducer into your vagina. You may feel some pressure from the transducer, but it shouldn’t cause pain. Your bladder needs to be empty or just partly full. This kind of ultrasound also takes about 20 minutes.
In special cases, your provider may use these kinds of ultrasound to get more information about your baby:
- Doppler ultrasound. This kind of ultrasound is used to check your baby’s blood flow if he’s not growing normally. Your provider uses a transducer to listen to your baby’s heartbeat and to measure the blood flow in the umbilical cord and in some of your baby’s blood vessels. You also may get a Doppler ultrasound if you have Rh disease. This is a blood condition that can cause serious problems for your baby if it’s not treated. Doppler ultrasound usually is used in the last trimester, but it may be done earlier.
- 3-D ultrasound. A 3-D ultrasound takes thousands of pictures at once. It makes a 3-D image that’s almost as clear as a photograph. Some providers use this kind of ultrasound to make sure your baby’s organs are growing and developing normally. You also may get a 3-D ultrasound to check for problems in the uterus.
- 4-D ultrasound. This is like a 3-D ultrasound, but it also shows your baby’s movements in a video.
Does ultrasound have any risks?
Generally US is safe for you and your baby when done by your health care provider. Because ultrasound uses sound waves instead of radiation, it’s safer than X-rays. Providers have used ultrasound for more than 30 years, and they have not found any dangerous risks. So, the risk level is almost non existent
If your pregnancy is healthy, ultrasound is good at ruling out problems, but not as good at finding them. It may miss some birth defects. Sometimes, a routine ultrasound may suggest that there is a birth defect when there really isn’t one. While follow-up tests often show that the baby is healthy, false alarms can cause worry for parents. You may know of some places, like stores in a mall, that aren’t run by doctors or other medical professionals that offer “keepsake” 3-D or 4-D ultrasound pictures or videos for parents.
Please be reminded, The American College of Obstetricians and Gynecologists, the Food and Drug Administration and the American Institute of Ultrasound in Medicine do not recommend these non-medical ultrasounds. The people doing them may not have medical training and may give you wrong or even harmful information. So be aware and forewarned!
What happens after an ultrasound?
For most women, ultrasound shows that the baby is growing normally. If your ultrasound is normal, just be sure to keep going to your prenatal checkups. That’s all!
However, sometimes, ultrasound may show that you and your baby need special care. For example, if the ultrasound shows your baby has spina bifida, she may be treated in the womb before birth. If the ultrasound shows that your baby is breech (feet-down instead of head-down), your provider may try to flip your baby’s position to head-down, or you may need to have a cesarean section (also called C-section). A C-section is surgery in which your baby is born through a cut that your doctor makes in your belly and uterus.
Finally, no matter what an ultrasound shows, talk to your provider about the best care for you and your baby.
Dr. Chudi Ufondu
References, Adaptations & Photo Credit