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Is an ultrasound safe?
In most cases, yes. Ultrasound scans are widely considered safe and are commonly used during pregnancy, as well as to look at organs, blood vessels and soft tissues.
Unlike X-rays and CT scans, ultrasound does not use ionising radiation. Instead, it uses high-frequency sound waves to create images inside the body.
How ultrasound works
During a scan, a handheld probe sends sound waves into the body. These waves bounce back from different tissues and are turned into a live image on a screen.
This process is painless for most people. You may feel a little pressure if the probe needs to be pressed firmly against the skin.
Are there any risks?
For standard diagnostic scans, the risks are thought to be very low. Ultrasound has been used for many years in NHS care and has a strong safety record.
Some people may experience mild discomfort, especially during internal scans or when the bladder needs to be full. Serious side effects are rare.
Ultrasound in pregnancy
Ultrasound is routinely used in pregnancy in the UK to monitor the baby’s development. It is generally regarded as safe when carried out by trained healthcare professionals.
Most women have reassurance scans and the 12-week and 20-week scans as part of their antenatal care. If more scans are needed, your midwife or doctor will explain why.
When to be cautious
Although ultrasound is safe in medical settings, it should only be used when there is a clear reason. Unnecessary scans, including non-medical “keepsake” scans, are not recommended.
It is also important that scans are performed by properly trained staff. This helps ensure the machine is used correctly and the images are interpreted accurately.
What to expect at a scan
Most ultrasound scans are quick and straightforward. You may be asked to drink water beforehand for some types of scan, such as a pelvic or early pregnancy scan.
The sonographer will usually apply gel to your skin and move the probe over the area being examined. Results may be discussed straight away or sent to your GP, midwife or consultant.
Summary
Ultrasound is generally a safe and effective way to look inside the body without radiation. It is a routine part of many NHS investigations and pregnancy checks.
If you are unsure about a scan, speak to your GP, midwife or sonographer. They can explain why it is needed and what to expect.
Frequently Asked Questions
Ultrasound safety refers to using diagnostic or therapeutic ultrasound at appropriate settings and durations to minimize any risk to patients, operators, and developing fetuses.
Ultrasound safety in routine medical imaging is generally considered very high when performed by trained professionals using standard clinical protocols and the lowest effective output.
The main ultrasound safety concerns are heating of tissues, mechanical effects such as cavitation, and unnecessary exposure when ultrasound is used longer or more intensely than needed.
Yes, ultrasound safety is especially important during pregnancy because fetal exposure should be limited to medically necessary scans performed with appropriate settings.
Yes, ultrasound safety can be maintained during repeated scans by keeping each examination clinically justified, efficient, and within recommended exposure limits.
Ultrasound safety is the shared responsibility of the clinician, sonographer, and facility, with the operator controlling settings, duration, and proper use of the equipment.
Ultrasound safety differs from X-ray safety because ultrasound uses sound waves rather than ionizing radiation, so it does not carry the same radiation-related risks.
Ultrasound safety is affected by output power, scan duration, frequency, mode used, and how the transducer is positioned on the body.
Providers can improve ultrasound safety by using the lowest effective output, limiting scan time, following manufacturer guidance, and choosing ultrasound only when medically indicated.
Patients should know that ultrasound safety is generally excellent, the test is noninvasive, and any questions about benefits and risks should be discussed with the care team.
Yes, Doppler ultrasound safety can require extra attention because Doppler modes may use more acoustic energy than standard imaging modes, especially during prolonged use.
The ALARA principle in ultrasound safety means keeping exposure As Low As Reasonably Achievable while still obtaining the needed diagnostic information.
Yes, ultrasound safety can be an issue in home or consumer devices if they are used improperly, for too long, or in ways not supported by medical guidance.
Yes, ultrasound safety can depend on the body part being scanned because different tissues absorb sound energy differently and some areas may be more sensitive.
Ultrasound safety is monitored by controlling the machine settings, observing exposure indicators when available, and stopping once enough diagnostic information has been obtained.
Ultrasound safety is improved by formal training in sonography or clinical ultrasound, including machine operation, physics basics, and safe exposure practices.
Incorrect gel use usually does not create major ultrasound safety problems, but proper gel application helps ensure good image quality and reduces the need for repeated scanning.
Signs of poor ultrasound safety practice include unnecessary prolonged scanning, overly high output settings, lack of documentation, and using ultrasound without a clear medical reason.
No, therapeutic ultrasound safety is different because treatment devices intentionally deliver more energy to tissue, so exposure controls and clinical oversight are more critical.
Patients can discuss ultrasound safety by asking why the scan is needed, whether alternatives exist, how long it will take, and what steps are used to minimize exposure.
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