If you've had a baby scan before, whether with the NHS or at a private ultrasound clinic like First Encounters, you were probably advised you to arrive with a full bladder – but why? Ultrasound is a non-invasive imaging technique, so why do you need to have a full bladder?
In this blog, we will explore how a full bladder helps sonographers to get a clear picture of your baby.
What Is an Ultrasound Scan?
An ultrasound scan is a medical imaging technique that uses high-frequency sound waves to create real-time images and videos of the inside of your body.
These sound waves are emitted by a probe that is placed against the skin. The waves bounce off your internal tissues and organs, creating 'echoes' that can then be used to generate images that are displayed on a monitor.
Here's an example of what ultrasound imaging looks like:
What Role Does the Bladder Play in Ultrasound Scans?
When we're using ultrasound to capture images of a baby in the womb, a full bladder is helpful because it helps to push the uterus up and the intestines away, creating a clearer path for the ultrasound waves and helping our sonographer to get a better picture of the mother's uterus.
When the bladder is full, it also acts as a natural 'acoustic window'. The liquid in the bladder allows sound waves to travel more easily, resulting in better image resolution. Plus, a full bladder provides an identifiable contrast to the surrounding organs, aiding in the accurate interpretation of the scan.
If the bladder is empty, the intestines and other surrounding structures can obstruct our view of the uterus or make the uterus less distinguishable from other organs, leading to unclear images. That is why if your bladder is not full enough for your ultrasound scan, the sonographer may need to reschedule or repeat your exam.
How Much Water Should You Drink Before an Ultrasound Scan?
If you come to First Encounters for your ultrasound scan, we'll ask you to drink 500ml to 1 litre of water about one hour before the exam. You should then try to avoid urinating until the ultrasound is complete in order to get the best possible scan images.
If you are ever unsure of what to do before an ultrasound, it is always a good idea to call ahead and ask the medical professional performing the scan for specific instructions.
If you have any questions about the pregnancy scans we offer here at First Encounters, please don't hesitate to contact us and a member of our team will be happy to help.
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