Repeated Ultrasound Scans During Pregnancy – Are They Safe?

4 min read

Written by Pradeep


Repeated Ultrasound Scans During Pregnancy

Your whole world changes once your pregnant, and so does your life and your daily routine. There are multiple trips to your OBGYN to ensure that your little munchkin is doing fine and growing well, multiple blood and urine tests to ensure that all parameters like haemoglobin, blood sugar levels, and other nutritional levels are at the recommended levels. And your doctor will also put you through multiple ultrasound scans. While all the other procedures are routine and totally safe, when it comes to ultrasounds, you may worry if repeated ultrasound scans during pregnancy are safe.

Ultrasound scans are done to assess the growth and development of your baby. While a doctor routinely may recommend 5 to 6 scans for a healthy mother and a healthy fetus, the number may go up if they notice any anomaly. So are so many ultrasound scans safe for you? And why would there be a necessity for repeated ultrasounds? Read the article to know more.

In This Article

How Safe Are Repeated Ultrasound Scans During Pregnancy?

Like many scientific and technological things that are introduced in the last few decades, the long term effects of ultrasound scanning on your baby is, unfortunately, not known. However, since it has been prevalent in the last 10+ years, we can safely infer that there has not been any evidence of the scan causing harm to the baby. Usually, a pregnant woman with no complication is advised to have at least five scans during her pregnancy. Millions of women give birth to healthy babies after these five scans – so it is definitely safe.

But more importantly, a scan helps the doctor assess your baby’s heartbeat, growth rate, position of the baby, the amount of amniotic fluid inside your womb and the position of the placenta. It has also proven to be a great diagnostic tool to detect birth defects such as Down’s syndrome in unborn babies.

So if you weigh the benefits against the potential “unknown” risks, then ultrasound scans definitely get a green flag. This is the reason we say that as long as you have only as many number of scans as your doctor has advised (which is most often – 5), then it should be okay.

[Read : Sonography During Pregnancy]

Can Ultrasound Scans Be Dangerous For My Baby?

ultrasound of fetus

Although it is not risky, it is good to understand how the scan works and what are the potential risks involved.

When the radiologist moves the ultrasound probe over your abdomen, it emits high frequency waves, which bounce off the baby. These bounced off waves help forming an image of the baby. Similarly the radiologist is able to get an image of the placenta, the cervix, the uterus and so on. These high frequency waves can also produce heat. But, do not panic. The intensity of the ultrasound used during pregnancy scan is very less, so the heat generated is only 1° Celsius or below.

That said, medical researchers claim that if the scan results in the temperature of the body tissues being scanned (in this case the fetus) goes up by even 4° Celsius, then it can be very harmful. For instance, if the normal body temperature is 37° Celsius, then it should not go higher than 41° Celsius. Again, no need to panic. The temperature of the tissue spiking up that much during an ultrasound scan is very unlikely. This is because:

  • The amniotic fluid in which the fetus lies protects it from the heat generated during the scan.
  • The baby is moving around a lot, so no single body part is exposed to the scan or the high temperature for long.
  • The radiologist also keeps moving his probe and do not hold on to one position for a long time.

All these are applicable for 2D, 3D and 4D scanning.

[Read :  What Is A High-Risk Pregnancy?]

My Doctor Has Advised More Than 5 Scans During Pregnancy. What Do I Do?

repeated ultrasound scan

More number of scans are advised when it is a high risk pregnancy. For instance, your gynecologist will demand more scans if you:

  • Are 35 years or above.
  • Are carrying twins, triplets or more fetuses.
  • Have Placenta Previa.
  • Have had miscarriages before.
  • Had a still births before.
  • Have some medical condition that makes your pregnancy high risk.
  • Have some other kind of pregnancy complication.

In these cases, the doctor advises more scans because, like we said before, the benefits of the scan outweighs the risk involved. It is important for the doctor to ensure at all times that your pregnancy is viable and for this, the doctor might need more number of scans. If you are worried, or have more questions on why you require more-than-usual number of scans, then please talk to your doctor. Ensure that there is a medical reason to do more scans.

Apart from this, ensure you get your scan done by well-trained and experienced radiologists sitting in reputed clinics with good infrastructure.

Hope you have a safe pregnancy and delivery!

Read Also: 3D And 4D Ultrasound Scans During Pregnancy


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