The abdomen can give many signs: persistent pain, a feeling of bloating, gas or nausea that does not improve. When these symptoms appear, the doctor needs tools that allow him to see what is happening inside without resorting to invasive procedures. In this context, in the face of pain, inflammation or digestive discomfort: in which cases an abdominal ultrasound can be a useful part of the study, this test is usually one of the first options, because of its safety, its easy access and because it allows several organs to be evaluated in a single session.
What is an abdominal ultrasound and what organs does it evaluate?
What does the procedure consist of?
Abdominal ultrasound is an imaging test that uses high-frequency sound waves to form real-time images of the organs in the abdomen. It does not emit radiation, is noninvasive and, in most cases, is painless. The specialist passes a transducer over the skin of the abdomen (a conductive gel is applied) and the images are instantly viewed on the screen.
Organs of the digestive system that can be visualized
This test can evaluate the liver, gallbladder, bile ducts, pancreas, spleen, kidneys, and abdominal aorta. It also helps identify free fluid in the abdominal cavity and detect abnormal masses or growths. According to the American Academy of Radiology, abdominal ultrasound is the initial test of choice for evaluating pain in the upper right quadrant of the abdomen.
Digestive symptoms that warrant an abdominal ultrasound
Persistent or recurrent abdominal pain
When abdominal pain lasts more than a few days, recurs frequently, or is located in specific areas (such as the upper right side or the “pit of the stomach”), the doctor usually orders an imaging study to guide the diagnosis. Ultrasound can rule out or confirm structural causes such as gallstones, inflammation of the pancreas, or liver abnormalities.
Bloating and excessive gas
Bloating accompanied by gas, flatulence, or frequent belching can be caused by many causes. Although it is often functional, in other cases it is related to organ problems that can be seen by imaging, such as free fluid in the abdomen, a partial obstruction, or masses that compress the bowel. Ultrasound helps rule out these possibilities, and with that basis, the doctor can better direct the rest of the study.
Nausea, vomiting, and jaundice
Yellowing of the skin or eyes (jaundice), when it occurs along with nausea and vomiting, may suggest a blockage of the bile ducts or liver disease. In these conditions, abdominal ultrasound is usually the first test ordered to check the liver, gallbladder, and bile ducts and determine if additional tests are needed.
Frequent cases where abdominal ultrasound contributes to the diagnosis
Gallstones and gallbladder problems
Gallstones are one of the most common causes of abdominal pain in adults. Ultrasound has a sensitivity of more than 95% to detect them, making it the study of first choice. It also allows you to see signs of inflammation of the gallbladder, thickening of the wall and dilation of the bile ducts.
Acute Pancreatitis: Initial Imaging Evaluation
Acute pancreatitis is an inflammation of the pancreas that can cause severe pain in the pit of the stomach, nausea, and fever. Abdominal ultrasound is routinely ordered at baseline to identify gallstones as a possible trigger, assess the size of the pancreas, and detect peripancreatic fluid. In severe pancreatitis, intestinal gas can make it difficult to visualize the pancreas, but ultrasound is still the recommended starting point. The American Gastroenterological Association indicates that abdominal ultrasound should be performed in all patients with acute pancreatitis on admission.
Diseases of the liver and bile ducts
Fatty liver, cirrhosis, chronic hepatitis, and bile duct dilation are conditions that ultrasound can suggest with good accuracy. Ultrasound assesses the size, texture, and echogenicity of the liver, and can also detect focal lesions that require follow-up or a subsequent biopsy.
Evaluation of abdominal fluid and masses
The presence of free fluid in the abdomen (ascites) and the finding of enlarged masses or nodes are things that ultrasound can easily detect. This information guides the doctor on whether a CT scan, biopsy, or colonoscopy is needed to complete the study.
Preparing for Abdominal Ultrasound
Pre-Test Indications
To achieve good quality images, fasting for six to eight hours is recommended. This helps reduce intestinal gas and improves visualization of the gallbladder, which usually contracts after eating. The doctor may order additional restrictions depending on the reason for the study.
What you may feel during the procedure
It is usually a well-tolerated procedure. You may feel mild pressure when the transducer slides over your abdomen, especially if there are tender areas. The exam usually takes 20 to 40 minutes, depending on the complexity of the test. It does not require sedation or a subsequent recovery time.
Benefits and limitations of ultrasound in the digestive study
Advantages of abdominal ultrasound
Among its main advantages are that it does not use ionizing radiation, is widely available, has a lower cost compared to other studies, and allows you to see structures in real time. It can also evaluate blood flow if Doppler is added, which provides useful vascular information in certain conditions. The World Health Organization recognizes ultrasound as an essential diagnostic imaging tool in primary and specialized care settings.
When Ultrasound Isn’t Enough
Intestinal gas can make it difficult to see deep structures, such as the pancreas, in people with marked abdominal distention. It is also less accurate at evaluating the small intestine, retroperitoneum, and small lesions. In those situations, the doctor may order additional tests.
Other complementary studies: CT scan, endoscopy and blood tests
Computed tomography offers more anatomical detail and is essential in severe pancreatitis, retroperitoneal masses or acute abdominal conditions. Upper gastrointestinal endoscopy allows direct observation of the esophagus, stomach and duodenum, and colonoscopy evaluates the colon. Blood tests provide data on liver function, markers of pancreatic inflammation and other parameters that complement the image. No study replaces another: the specialist defines which combination is the most appropriate according to the clinical picture. According to the American College of Gastroenterology, integrating imaging studies with the laboratory improves diagnostic accuracy in digestive diseases.
Warning signs that require urgent medical attention
There are symptoms that should not be left for a scheduled consultation. If abdominal pain is severe, appears suddenly, or is accompanied by high fever, persistent vomiting, digestive bleeding, unintentional weight loss, or jaundice, medical attention should be sought immediately. These conditions may correspond to severe acute pancreatitis, biliary obstruction, visceral perforation, or other emergencies that require urgent evaluation and, often, immediate imaging studies.
Frequently asked questions about pain, inflammation or digestive discomfort: in which cases can an abdominal ultrasound be a useful part of the study?
Does abdominal ultrasound detect all digestive problems?
No. Ultrasound is very useful for evaluating solid organs such as the liver, pancreas and gallbladder, but it has limitations in studying the intestine, esophagus and very small lesions. For this reason, in many cases it is complemented by other studies such as upper gastrointestinal endoscopy, colonoscopy or computed tomography.
How long does it take to get the results?
The imaging specialist interprets the study during or just after the procedure. The written report is usually ready the same day or within the following hours, depending on the center where it is performed.
Does Doppler ultrasound provide additional information?
Yes. Doppler allows blood flow to be evaluated in vessels in the abdomen, such as the portal vein or hepatic artery. It is especially useful in liver diseases, portal hypertension and transplant follow-up.
What is the difference between ultrasound and CT scan?
Ultrasound does not use radiation, is usually more accessible, and is ideal as a first study. CT scans provide more detailed images of the entire abdomen, including structures that ultrasound does not visualize well, but exposes to radiation. They complement each other and their indication depends on the clinical judgment of the specialist doctor.
At CENDIGASTRO, the team of specialists in gastroenterology, internal medicine and hepatology guides each patient on which is the most appropriate study according to their clinical condition. Dr. Rita Isabel Aguilar Cacó, a specialist in Gastroenterology, Digestive Endoscopy and Internal Medicine, with international training in gastrointestinal motility and extensive experience in complex digestive diseases, leads a comprehensive diagnostic approach that combines imaging, laboratory and clinical criteria to arrive at accurate answers.
If you have abdominal pain, bloating, persistent gas, or other digestive symptoms that do not subside, you can contact CENDIGASTRO at the Plaza Rali Business Center, Tower A, Ground Floor, Panama, or at the Hyatt Regency Panama City, through the numbers 6794-3486, +507 6203-4859 or 374-2054, and by email at atencionalcliente@cendigastro.com.
Content reviewed by Dr. Rita Isabel Aguilar Cacó, specialist in Gastroenterology, Digestive Endoscopy and Internal Medicine, CENDIGASTRO, Panama.
If you have pain, bloating or digestive upset: When an abdominal ultrasound can be a useful part of the study depends on your symptoms and medical judgment, and this exam is often a key starting point.
