Is ultrasound safe?
Ultrasound uses sound waves rather than ionizing radiation and has been widely used for decades. Clinics follow safety guidelines.
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Ultrasound uses high-frequency sound waves, not ionizing radiation like X-rays or CT scans. It has been used in medicine for many decades, including routinely during pregnancy.
How clinics keep it safe
- Trained sonographers carry out the scan
- Machines are set to use the lowest energy needed for a clear image
- Scans are done for a medical reason, for as long as needed
- Professional bodies publish safety guidelines that clinics follow
What you might feel
The gel can feel cold. Pressure from the probe may be uncomfortable over a tender area. Internal scans can feel strange but should not be painful; tell the sonographer if anything hurts.
Questions to ask
If you have concerns, ask the person who referred you why the scan is needed and what it will show. They can talk through your situation.
This is general information, not medical advice. Always follow the instructions from your own care team. More in what happens during an ultrasound.
Ultrasound scans explained in plain language for patients