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Radiology • General Ultrasound

USG Abdomen

Also called: Abdominal Ultrasound • Whole Abdomen Ultrasound • Abdominal Sonography

Abdominal ultrasound uses sound waves to examine organs and blood vessels inside the abdomen. It commonly assesses the liver, gallbladder, bile ducts, pancreas, spleen, kidneys and abdominal aorta.

A “whole abdomen” referral may also include the urinary bladder and selected pelvic organs. The exact protocol depends on the clinical question, so fasting or a full bladder may be required—or both.

Book a Scan How to prepare ↓

A scheduled scan is not emergency care

Seek Urgent Assessment for Severe Symptoms

Go to an emergency service or seek immediate medical advice for:

  • Sudden severe abdominal or back pain, fainting, sweating, confusion or collapse.
  • Severe upper-abdominal pain with fever, shaking chills or yellow skin and eyes.
  • Persistent vomiting, increasing abdominal swelling or inability to pass stool or gas.
  • Vomiting blood, black stools or heavy rectal bleeding.
  • A rigid, very tender abdomen or pain that rapidly worsens.
  • Severe pain during pregnancy, heavy vaginal bleeding or faintness.
  • Chest pain, breathlessness or pain spreading to the chest, jaw, shoulder or arm.

Do not wait for a routine ultrasound appointment. Emergency assessment may require examination, blood tests, ECG, urgent ultrasound, CT or surgery depending on the suspected cause.

What is an Abdominal Ultrasound?

A handheld probe sends high-frequency sound waves through gel placed on the skin. Echoes from organs and tissues are converted into real-time images. The radiologist can assess organ size, shape, internal appearance, fluid, stones and selected blood-flow patterns.

Ultrasound does not use the ionising radiation used in X-rays or CT. A standard abdominal scan is external and non-invasive. Gentle probe pressure may feel uncomfortable over an already painful area, but the examination should not create new severe pain.

“Whole Abdomen” Does Not Mean Every Organ is Seen Completely

Ultrasound is excellent for many solid organs and fluid-filled structures, but gas-filled bowel, deep tissues and some body regions may remain partly obscured. The report documents both the findings and any technical limitations.

What is the Difference Between Scan Protocols?

USG upper abdomen Usually focuses on the liver, gallbladder, bile ducts, pancreas, spleen, kidneys and upper abdominal vessels. Fasting is commonly required.
USG whole abdomen Commonly combines upper-abdominal assessment with kidneys and urinary bladder. Selected pelvic organs may be included according to the referral and local protocol.
USG abdomen and pelvis Explicitly includes pelvic assessment. A comfortably full bladder creates an acoustic window for the bladder, uterus and ovaries or prostate region.
USG KUB or urinary tract Focuses on kidneys, ureters where visible and bladder, often with pre- and post-void bladder volume. This does not automatically include a complete hepatobiliary examination.
Targeted abdominal ultrasound Answers a specific question—for example gallstones, an abdominal lump, appendix, hernia, ascites, aorta or a known lesion—using a focused protocol.

Scan names are used differently between facilities. Bring the referral or prescription so the radiologist can match the examination to the clinician's question rather than relying on the label alone.

Why Might USG Abdomen Be Requested?

Pain or tenderness Upper abdominal, right-sided, flank or generalised abdominal symptoms.
Abnormal blood tests Liver enzymes, bilirubin, kidney function or other results requiring imaging correlation.
Swelling or a lump Abdominal distension, suspected organ enlargement, ascites or a palpable mass.
Urinary symptoms Blood in urine, infection, flank pain, poor emptying or suspected obstruction.

Other common indications include:

  • Jaundice or suspected gallstones and bile-duct obstruction.
  • Suspected fatty liver, chronic liver disease or portal hypertension.
  • Follow-up of a previously identified organ or vascular finding.
  • Unexplained weight loss, fever or anaemia as part of a wider investigation.
  • Assessment after selected injuries or procedures.
  • Guidance for drainage, aspiration or biopsy when separately planned.
  • Screening or surveillance for abdominal aortic aneurysm in selected patients.

The same symptom can arise from structures that ultrasound does not show well. A normal scan may still be useful, but it does not end the investigation when symptoms or laboratory findings remain concerning.

Which Organs Are Examined?

Liver Size, outline, echotexture, focal lesions, major vessels and features of fatty change or chronic liver disease. Ultrasound appearance must be correlated with liver blood tests.
Gallbladder and bile ducts Gallstones, sludge, wall thickening, surrounding fluid, tenderness and bile-duct calibre. Fasting helps distend the gallbladder for clearer assessment.
Pancreas Visible portions are assessed for size, contour, focal abnormalities and duct dilatation. The pancreas is frequently partly obscured by stomach or bowel gas.
Spleen Size, internal appearance and focal abnormalities. Enlargement can have infectious, haematological, liver-related and other causes.
Kidneys Size, position, cortical appearance, dilatation of the collecting system, visible stones, masses and other structural findings. Small ureteric stones may not be seen directly.
Abdominal aorta and major vessels Aortic calibre and selected vessel features are assessed where visible. A dedicated Doppler study is needed for detailed blood-flow questions.
Peritoneal spaces Free fluid or ascites and selected collections may be visible. Absence of free fluid does not exclude every inflammatory, bleeding or bowel condition.
Bladder and pelvis when included Bladder filling, wall, visible contents and residual urine may be assessed. The uterus, ovaries or prostate region require an appropriate pelvic protocol and adequate bladder filling.

What Does Ultrasound Not Show Reliably?

  • Much of the stomach and bowel because air and gas block sound waves.
  • The complete appendix in every patient; a non-visualised appendix does not exclude appendicitis.
  • Small ulcers, early bowel cancers, subtle inflammation or the inner lining assessed by endoscopy.
  • Every small kidney or ureteric stone.
  • The complete pancreas when bowel gas or depth prevents adequate views.
  • Small or early tumours that do not alter the ultrasound appearance.
  • Lung, bone and deep retroperitoneal detail as clearly as appropriate CT or MRI.

A report may say an organ is “partly obscured by bowel gas” or “suboptimally visualised.” This is a technical limitation, not a diagnosis. The referring doctor decides whether the unanswered question requires repeat ultrasound, CT, MRI, endoscopy, laboratory tests or clinical follow-up.

How Should I Prepare?

Follow the instructions given for your specific appointment. Preparation varies because a distended gallbladder and a filled urinary bladder solve different imaging problems.

Fasting Many upper- or whole-abdominal scans require about six hours without food. This keeps the gallbladder distended and can reduce interfering bowel contents. Clear water may be allowed.
Full bladder Needed when the bladder, urinary tract or pelvis is included. Drink the amount advised and avoid passing urine until instructed; extreme pain from overfilling is unnecessary.
Medicines Take regular medicines with small sips of water unless your clinician gives different instructions. Bring a list of medicines and relevant allergies.
Diabetes or other special needs Contact the imaging team before fasting if you use diabetes treatment, are pregnant, are a child, are frail or have a condition affected by delayed meals or fluid intake.
  • Bring the referral, previous ultrasound/CT/MRI reports and relevant laboratory results.
  • Wear loose clothing that allows access from the lower chest to the lower abdomen.
  • Tell the team about severe pain, recent surgery, dressings or mobility assistance before the scan.
  • If you cannot follow the preparation safely, call rather than cancelling or improvising.

What Happens During the Scan?

1 The clinical question is confirmed

The radiologist reviews your symptoms, referral, relevant history and earlier imaging and confirms whether the requested protocol and preparation are appropriate.

2 You lie on the examination couch

Clothing is moved away from the abdomen while privacy is maintained. You may begin on your back and later turn onto one side or sit partly upright.

3 Gel and the probe are applied

Water-based gel removes air between the skin and probe. The probe is moved over the abdomen with enough pressure to obtain diagnostic views.

4 Breathing and position are adjusted

You may be asked to take a deep breath, hold it briefly or change position. This moves organs below the ribs and helps the radiologist see around bowel gas.

5 Bladder measurements may be repeated

If urinary emptying is part of the referral, the bladder is measured while full and again after you pass urine to calculate post-void residual volume.

6 Images are reviewed and reported

Selected images and measurements are saved. The radiologist prepares a formal report for the referring clinician and flags urgent findings through the appropriate pathway.

The scan itself often takes around 15–30 minutes but can take longer when several regions, Doppler measurements or difficult views are required. You can usually return to normal activity immediately afterwards.

When is Doppler Added?

Doppler ultrasound displays the direction and pattern of blood flow. It is not automatically a full vascular examination simply because colour appears on the screen.

Doppler may be used to assess:

  • Portal and hepatic vessels in suspected liver or portal-venous disease.
  • Renal blood flow in selected kidney or vascular questions.
  • Aortic and other abdominal vessel patency or calibre.
  • Blood flow within or around a focal lesion.
  • Suspected thrombosis, narrowing or altered direction of flow.

A dedicated Doppler study may need additional preparation, measurements and time. The referral should state the vascular question so the correct examination can be booked.

What Do Common Report Terms Mean?

Increased liver echogenicity / fatty liver The liver appears brighter than expected, commonly suggesting fat accumulation. Ultrasound does not precisely grade inflammation or fibrosis, so metabolic and laboratory assessment matters.
Hepatomegaly / splenomegaly The liver or spleen measures larger than the reference range. Size is a finding, not a cause, and must be interpreted with symptoms, examination and blood tests.
Cholelithiasis / biliary sludge Gallstones or thick particulate bile are seen. Symptoms, gallbladder wall, tenderness, bile ducts and laboratory results determine whether urgent or planned treatment is needed.
Bile-duct dilatation A bile duct measures wider than expected. Age, previous gallbladder surgery, liver tests and the visibility of a possible obstructing cause influence the next step.
Renal calculus / hydronephrosis A visible kidney stone or dilatation of the urine-collecting system is reported. Hydronephrosis describes dilatation and does not by itself identify the cause or severity of functional obstruction.
Increased renal cortical echogenicity The kidney tissue appears brighter than expected. This can accompany medical kidney disease, but kidney-function and urine tests are required for interpretation.
Ascites Free fluid is present in the abdomen. Ultrasound can estimate distribution and guide sampling, but history, liver, heart, kidney, infection and malignancy evaluation may be needed.
Focal lesion / indeterminate lesion An area differs from surrounding tissue but is not fully characterised by this examination. Contrast CT, MRI, targeted ultrasound or interval follow-up may be recommended.

Words such as “mild,” “borderline” and “incidental” describe imaging appearance, not importance for a particular person. The referring clinician decides relevance using age, symptoms, risk factors and test results.

What Happens if the Scan Finds Something?

Many findings are benign or require only clinical correlation. Others need confirmation, treatment or surveillance. The report may recommend a next step, but the referring clinician builds the full plan.

  • Blood or urine tests to assess organ function, infection or metabolic risk.
  • Targeted or Doppler ultrasound for a more specific question.
  • CT or MRI to characterise a deep, complex or indeterminate finding.
  • Endoscopy when symptoms suggest disease of the stomach or bowel lining.
  • Specialist review by gastroenterology, surgery, urology, nephrology, gynaecology or another team.
  • Image-guided aspiration or biopsy when tissue or fluid analysis is necessary.
  • Planned interval imaging when stability over time helps establish significance.

Seek clarification if the report contains an urgent recommendation, if symptoms are worsening or if you do not know who will review the result. Do not assume that “follow-up advised” will be arranged automatically.

Myth vs Fact

Myth Ultrasound exposes the abdomen to X-rays.
Fact Ultrasound creates images using sound waves and does not use ionising radiation. A standard abdominal scan is non-invasive.
Myth A whole-abdomen scan shows every possible abdominal disease.
Fact Gas-filled bowel, deep tissues and subtle disease may not be visible. CT, MRI, endoscopy or laboratory tests can still be necessary.
Myth A normal ultrasound means the pain is not real.
Fact Pain can arise from bowel, stomach, muscles, nerves and early or microscopic disease that ultrasound cannot demonstrate. Persistent symptoms still deserve clinical review.
Myth Everyone should fast and fill the bladder for every abdominal scan.
Fact Preparation follows the requested protocol. Upper-abdominal imaging often needs fasting; urinary or pelvic imaging may need a full bladder. Follow the booking instructions.

Frequently Asked Questions

How long should I fast?

Many abdominal protocols use approximately six hours of fasting, but instructions vary. Clear water and essential medicines may be allowed. Follow the instructions issued for your appointment, especially if you have diabetes, are pregnant or are booking a child.

Do I need a full bladder for USG abdomen?

Only when the urinary bladder or pelvis forms part of the examination. Upper-abdominal scans may not need one. “Whole abdomen” protocols differ, so confirm the preparation when booking.

Can I take my medicines before the scan?

Regular medicines are usually taken with small sips of water. Do not alter diabetes treatment around fasting without advice from the booking team or treating clinician.

Can ultrasound detect all gallstones?

Ultrasound is very useful for gallbladder stones, but tiny stones, stones in parts of the bile duct and technically limited views can be missed. MRCP, endoscopic ultrasound or other tests may be needed when clinical concern remains.

Can a normal ultrasound rule out kidney stones?

No. Some small kidney stones and many ureteric stones are not seen directly. Ultrasound may show secondary obstruction, while non-contrast CT is more sensitive when appropriate.

Can ultrasound diagnose cancer?

It can detect some suspicious masses but often cannot determine the exact tissue type or extent. CT, MRI, endoscopy, laboratory tests or biopsy may be required. A normal ultrasound also cannot exclude every early cancer.

Why was my pancreas not clearly seen?

The pancreas lies deep behind the stomach and is commonly obscured by bowel gas. Fasting, position changes and probe pressure may help, but CT or MRI may be necessary if the pancreas is the main clinical concern.

When will I receive the result?

The radiologist reviews the saved images and issues a formal report to the referring clinician. Timing varies with urgency and hospital workflow. Ask before leaving how the result will be shared and who is responsible for discussing it with you.

Related Patient Guides

Abdominal and urinary symptoms often overlap. The correct scan protocol depends on the suspected organ and clinical question.

Symptom Flank Pain Loin or Kidney-area Pain Read guide → Condition Kidney Stones Renal Calculi Read guide → General Surgery Abdominal Pain Warning Signs / Examination / Imaging Choice Read patient guide → General Medicine Fatty Liver Disease MASLD, Fibrosis Risk and Follow-Up Read medical guide →

A Note From Our Doctors

The information on this page is intended to help you understand your condition. It should not be considered a diagnosis or a substitute for a consultation with a qualified medical professional.

Every patient is unique. The same symptom can have different causes in different individuals, and the most appropriate investigations and treatment depend on your medical history, examination findings, age, existing medical conditions and test results.

At SR Speciality Hospital, we believe in treating the whole patient—not just a symptom, scan or laboratory report. Every treatment plan is individualised after careful medical evaluation.

Radiology Appointments

Have you been advised to undergo USG abdomen?

Contact the hospital with the exact referral so the team can confirm whether fasting, a full bladder or both are required. Severe or rapidly worsening symptoms need urgent clinical assessment.

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