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Ultrasound — what you should know in 2026
How ultrasound imaging works, what it is best at showing, why it is so safe and operator-dependent, and how to choose a centre with an experienced sonographer.
Written by our medical board, reviewed quarterlyUpdated 21 January 19706 min read
What ultrasound is and when it's used
Ultrasound imaging uses high-frequency sound waves, not radiation, to produce real-time images of the body's soft structures. A handheld probe sends sound into the body and listens for the echoes, which a computer turns into a live picture. Because it is safe, quick and inexpensive, it is one of the most widely used tests in medicine.
It is the go-to scan for the abdomen and pelvis (liver, kidneys, gallbladder), the thyroid and other superficial structures, blood vessels (via Doppler, which shows blood flow), the heart (echocardiography), and pregnancy monitoring. It is frequently included in check-up packages as a safe first look at the internal organs.
Ultrasound has limits: sound waves do not pass well through bone or gas, so it is less useful for the lungs, the bowel and structures deep behind bone. For those, a CT or MRI is often needed. But as a safe, real-time, radiation-free first test, ultrasound is hard to beat for the questions it suits.
How the scan works and what to expect
For a typical ultrasound you lie on a couch while a sonographer applies a water-based gel to the skin and moves a probe over the area being examined. The gel ensures good contact; it is harmless and wipes off afterwards. The scan is painless, takes roughly fifteen to thirty minutes, and produces images the operator can view in real time.
Some examinations have specific preparation: an abdominal scan of the gallbladder may require fasting, and a pelvic scan sometimes needs a full bladder. Certain internal scans use a small probe inserted into a body cavity for a closer view, which the centre will explain and obtain your consent for in advance.
Because the images are generated and read live, the skill of the person performing the scan is decisive. Unlike a CT or MRI, where a stored dataset is reviewed later, much of an ultrasound's value is created in the moment by the sonographer choosing the right views and recognising what matters.
What it costs and choosing a skilled operator
Ultrasound is among the most affordable tests in this category. A single-region scan abroad typically costs only the low tens to low hundreds of euros, and it is often bundled into broader check-up packages at little extra cost. Doppler studies and echocardiography sit at the higher end because of the expertise involved.
The single most important factor in ultrasound quality is the operator. Because the images are acquired and interpreted in real time, an experienced sonographer or radiologist produces a far more reliable result than the same machine in inexperienced hands. Ask who performs and reports your scan and what their qualifications are.
Look for centres with appropriate accreditation such as JCI or TEMOS and scans reported by qualified professionals. Confirm that you receive a written report and representative images so your own doctor can review the findings, since the live nature of the scan means the report captures what the operator saw.
Safety, results and follow-up
Ultrasound is considered very safe. It uses no ionising radiation, has no known harmful effects at diagnostic levels, and can be repeated freely — which is precisely why it is used routinely in pregnancy. There is no recovery period; you can resume normal activity immediately and travel home the same day.
Results are often available immediately or within a day, since the operator sees the images live and can flag findings on the spot. As with any imaging, an ultrasound may reveal incidental findings — common, harmless variations — and a good report distinguishes these from anything that needs follow-up.
Share the report and images with your own doctor, especially if a finding needs further assessment or another type of scan. Ultrasound is frequently the first step that decides whether more detailed imaging is required, so its findings are most useful when carried into your ongoing care.
Frequently asked
Is ultrasound safe?
Yes, it is considered very safe. It uses sound waves rather than ionising radiation, has no known harmful effects at diagnostic levels, and is used routinely even in pregnancy. It can be repeated freely.
Does an ultrasound hurt?
No. A standard scan is painless; you feel only the probe and a little cool gel on the skin. Internal scans may cause mild pressure but are generally well tolerated.
Do I need to prepare for an ultrasound?
It depends on the area. An abdominal scan may require fasting and a pelvic scan may need a full bladder, while many scans need no preparation. The centre tells you what is required in advance.
Why does the operator matter so much?
Because ultrasound images are acquired and interpreted in real time, the skill of the sonographer or radiologist is decisive. An experienced operator produces a far more reliable result than the same machine in inexperienced hands.
When is a CT or MRI needed instead?
Ultrasound does not pass well through bone or gas, so for the lungs, bowel, or deep structures behind bone a CT or MRI is often required. Ultrasound is frequently the first step that decides whether further imaging is needed.
How quickly will I get results?
Often immediately or within a day, since the operator views the images live. Confirm you receive a written report and representative images so your own doctor can review the findings.
