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Abdominal Ultrasound – Procedure and Clinical Use

An abdominal ultrasound is a painless imaging procedure used to examine the organs of the abdomen. It helps detect conditions affecting the liver, kidneys, spleen, and other abdominal structures.

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Things worth knowing about "Abdominal Ultrasound"

An abdominal ultrasound is a painless imaging procedure used to examine the organs of the abdomen. It helps detect conditions affecting the liver, kidneys, spleen, and other abdominal structures.

What is an Abdominal Ultrasound?

An abdominal ultrasound (also referred to as abdominal sonography or abdominal ultrasonography) is a non-invasive imaging technique that uses high-frequency sound waves to visualize the organs and structures within the abdominal cavity. The procedure is painless, does not involve ionizing radiation, and is generally very well tolerated. It is one of the most widely used diagnostic methods in modern medicine.

How Does an Abdominal Ultrasound Work?

During the examination, a small device called a transducer (probe) is placed on the skin of the abdomen, which has been coated with a special ultrasound gel. The gel ensures optimal contact between the probe and the skin, preventing air gaps that could interfere with the image. The transducer emits ultrasound waves that travel into the body and are reflected differently by various tissue structures. These reflected signals are processed by a computer in real time and displayed as an image on a monitor.

Which Organs Are Examined?

An abdominal ultrasound can assess the following organs and structures:

Liver: Size, shape, and tissue structure; detection of cysts, tumors, or fatty liver
Gallbladder and bile ducts: Identification of gallstones, inflammation, or duct dilation
Pancreas: Assessment for pancreatitis or tumors
Spleen: Size measurement and detection of abnormalities
Kidneys: Evaluation of size, shape, kidney stones, or cysts
Urinary bladder: Assessment of filling and wall structure
Aorta: Detection of enlargements (aneurysms)
Lymph nodes: Identification of enlarged nodes
Free fluid in the abdomen: Detection of ascites or internal bleeding

When is an Abdominal Ultrasound Performed?

Abdominal ultrasound is used for a wide range of symptoms and clinical questions, including:

Abdominal pain or cramps of unknown cause
Suspected gallstones or kidney disease
Monitoring of known conditions such as liver disease or abdominal aortic aneurysm
Routine preventive health check-ups
Investigation of nausea, vomiting, or unexplained weight loss
Evaluation following abdominal trauma
Palpable swellings or masses in the abdomen

How is the Procedure Performed?

To ensure clear imaging, patients are generally asked to fast for several hours before the examination, as food residues and intestinal gas can reduce image quality. The procedure itself typically lasts between 10 and 30 minutes. The patient lies comfortably on an examination table while the physician moves the transducer across the abdomen and observes the organs in real time on the monitor. The examination is painless, although slight pressure may be felt when the probe is pressed against more sensitive areas.

Advantages and Limitations

Advantages

No radiation exposure (unlike X-ray or CT scan)
Painless and non-invasive
Readily available and cost-effective
Real-time visualization of organs
Safe for children, pregnant individuals, and elderly patients

Limitations

Limited visualization when significant gas is present in the bowel
Image quality may be reduced in patients with obesity
Some structures are difficult to assess (e.g., behind bony structures)
Inconclusive findings may require further imaging such as MRI or CT

References

Dietrich, C.F. et al. - Ultrasonography in Internal Medicine. Springer Verlag, 2020.
European Federation of Societies for Ultrasound in Medicine and Biology (EFSUMB) - Guidelines and Recommendations for Gastrointestinal Ultrasound. Ultraschall in Med, 2018.
Rumack, C.M. et al. - Diagnostic Ultrasound, 5th Edition. Elsevier, 2018.

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