Complete abdominal ultrasound: what it includes, how to prepare, and what it detects
Clinical guide for patients and doctors · Colombia 2026
Total abdominal ultrasound: what it includes, how to prepare, and what it can detect
The most comprehensive guide to total abdominal ultrasound in Colombia — organs evaluated, correct differentiated preparation, what pathologies it detects in each organ, and when the doctor needs to complement it
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Reviewed by the medical team at GSMED Imaging
Specialists in diagnostic abdominal ultrasound. Content based on RadiologyInfo (ACR/RSNA), MedlinePlus NIH, MSD Manuals Professional Edition, Goldman-Cecil Medicine 27th ed. (2024), and preparation protocols from Clínica Medellín (Grupo QuirónSalud) and the International Hospital of Colombia.
ℹ️ Medical notice: This guide is for informational and educational purposes. The results of your abdominal ultrasound must be interpreted by the specialist who ordered it or by the radiologist who performed it, always in the context of your complete medical history. This information does not constitute a medical diagnosis.
Total abdominal ultrasound is the most requested imaging study in general medical practice in Colombia. It allows real-time visualization of the liver, gallbladder, pancreas, spleen, kidneys, bladder, and major abdominal vessels — all in a single study, without radiation, without pain, and with results on the same day. But for the study to be useful and complete, the correct preparation is just as important as the equipment that performs it.
1. What is total abdominal ultrasound, and how does it differ from an upper abdominal ultrasound?
The total abdominal ultrasound combines the evaluation of two distinct anatomical regions in a single study:
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Upper abdomen
Evaluates the organs of the upper hemiabdomen and flanks: liver, gallbladder, bile ducts, pancreas, spleen, kidneys, abdominal aorta, inferior vena cava, and major vascular structures. Requires fasting for 6–8 hours to correctly visualize the gallbladder and bile ducts.
Also called: upper abdominal ultrasound or hepatobiliary ultrasound
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Pelvis or lower abdomen
Evaluates the pelvic organs: urinary bladder, uterus and ovaries in women, or bladder and prostate in men. Requires a full bladder — drink 4–6 glasses of water one hour before and do not urinate until the study is finished.
Also called: pelvic or lower abdominal ultrasound
The key difference for the patient If your doctor orders only an "abdominal ultrasound" or "upper abdominal ultrasound," you only need to fast. If they order a "total abdominal ultrasound" or "abdominopelvic ultrasound," you need to fast AND have a full bladder. Confusing the preparations is the most frequent cause of incomplete or poor-quality studies that require repeating the exam.
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Organs and structures evaluated in a complete total abdominal ultrasound
20–40 min
Average duration of the complete bilateral study
0
Ionizing radiation — completely safe for all ages
8 h
Minimum fasting for optimal visualization of the gallbladder and pancreas
2. What organs and structures does it evaluate? The complete map
This is the complete inventory of what is included in a well-performed total abdominal ultrasound, what it evaluates in each organ, and what frequent pathologies it can detect:
🫀 Liver Right upper quadrant
Size (normal right lobe <16 cm), parenchymal echostructure, borders, homogeneous or heterogeneous echogenicity, hepatic and portal veins, focal lesions.
Frequently detects:
- Fatty liver (steatosis) — bright hyperechoic parenchyma
- Simple liver cysts — benign, very frequent
- Hemangiomas — most common hyperechoic liver lesion
- Cirrhosis — nodular surface, heterogeneous texture
- Hepatomegaly — cause or effect of multiple pathologies
- Liver masses — requires confirmation with CT or MRI
🟡 Gallbladder and bile ducts RUQ — under the liver
Gallbladder size, wall thickness (<3 mm normal), contents (anechoic bile), presence of stones, common bile duct dilation (normal <6–7 mm).
Frequently detects:
- Gallbladder stones — stones with posterior acoustic shadowing
- Acute cholecystitis — thickened wall, positive sonographic Murphy sign
- Biliary sludge — echogenic sediment without shadowing
- Dilated common bile duct — biliary obstruction, choledocholithiasis
- Gallbladder polyps — sessile lesions without shadowing
🩷 Pancreas Central epigastric region
Size of the head, body, and tail (difficult to see with intestinal gas), echogenicity, pancreatic duct (normal Wirsung <2 mm), focal lesions.
Detects when visible:
- Acute pancreatitis — edema, hypoechogenicity
- Chronic pancreatitis — calcifications, dilated duct
- Pancreatic cysts
- Pancreatic mass (limited — CT confirms)
🫁 Spleen Left upper quadrant
Size (normal maximum length <12 cm), homogeneous echostructure, focal lesions, presence of accessory spleens.
Frequently detects:
- Splenomegaly — sign of portal hypertension, hematological diseases
- Splenic cysts
- Splenic infarction — wedge-shaped hypoechoic area
- Post-traumatic lesions — laceration, hematoma
🫘 Kidneys Right and left flanks
Size (normal 9–13 cm length), cortex, medulla, renal sinus, renal pelvis (dilation), corticomedullary ratio, bilateral symmetry.
Frequently detects:
- Renal stones — stones with acoustic shadowing
- Hydronephrosis — dilation of the collecting system
- Simple renal cysts — very frequent in older adults
- Polycystic kidney
- Renal masses — requires confirmation with CT
- Nephrocalcinosis — parenchymal calcifications
🩸 Abdominal aorta and major vessels Abdominal midline
Aortic diameter (normal <3 cm), celiac trunk, superior mesenteric artery, splenoportal axis, inferior vena cava.
Detects:
- Abdominal aortic aneurysm — dilation ≥3 cm
- Portal hypertension — altered splenoportal flow with Doppler
- Portal thrombosis
- IVC distension — due to heart failure
💧 Urinary bladder Pelvis — requires a full bladder
Shape, size, wall thickness, bladder contents, post-void residual, intraluminal lesions.
Detects:
- Bladder stones — mobile stones with shadowing
- Bladder wall thickening — cystitis, chronic obstruction
- Bladder tumors — intraluminal projections
- Post-void residual — emptying dysfunction
🔵 Uterus and adnexa (women) / Prostate (men) Pelvis — requires a full bladder
Uterus: size, position, endometrium, myometrium. Ovaries: size, follicles, cysts. Prostate: volume (normal <30 cc in <50 years), echostructure, nodules.
Detects:
- Uterine fibroids — intramural hypoechoic nodules
- Simple and complex ovarian cysts
- Endometriomas — cysts with "ground-glass" contents
- Benign prostatic hyperplasia — volume increase
- Free pelvic fluid — hemorrhagic or inflammatory
3. Correct preparation: the most important step that many do wrong
Preparation for a total abdominal ultrasound has two components with different and sometimes contradictory instructions. Following both correctly determines if the study can be completed in a single appointment.
🟡 For the upper abdominal part — FASTING
- The night before: an early and light dinner before 7:00 p.m. — no fats, fried foods, or dairy that stimulate gallbladder contraction
- Fast for 6–8 hours: no food, no drinks (except small amounts of water to take medications). Clínica Medellín sets 8 hours as the minimum
- Medications: you can take your routine medications with the smallest possible sip of water
- Insulin: if you inject insulin, consult your doctor about the schedule to follow — fasting alters blood sugar
- Cigarettes and gum: avoid on the day of the study — they stimulate gastric motility and intestinal gas production
- Why fasting matters: a gallbladder full of distended bile is the best state to detect small stones. After eating, the gallbladder contracts and empties — stones can be hidden and the pancreas is surrounded by intestinal gas
🟢 For the pelvic part — FULL BLADDER
- Drink 4–6 glasses of water (approximately 1 liter) starting 1 hour before the exam
- Do not urinate from the time you start drinking the water until the technician tells you that you can — the pelvic study must be performed with the bladder at maximum filling
- Why a full bladder matters: the distended bladder acts as an "acoustic window" — ultrasound waves pass through the liquid without interference and allow visualization of the uterus, ovaries, and prostate that are right behind. An empty bladder makes it impossible to see these structures
- If you have an extreme urgency: notify the technician — in some cases, the pelvic part can be performed first and then the abdominal
- Children: fast for 2 hours. They do not need to drink additional water according to the Clínica Medellín protocol
The most frequent error in Colombia Arriving at the study with the correct fast but having urinated minutes before, or having drunk the water just as you arrive at the clinic (insufficient to fill the bladder). If you empty the bladder before the technician evaluates the pelvic part, that half of the study will have to be repeated another day. Arrive with time and with a full bladder before leaving home.
4. Why was the ultrasound ordered? The most frequent scenarios
The doctor orders a total abdominal ultrasound for many different reasons. Understanding what they are looking for according to your case helps you interpret the result more clearly:
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Scenario 1 — Pain in the right side or epigastrium after eating
"My right side hurts, especially after eating fatty foods. They ordered an ultrasound."
The doctor suspects biliary pathology — stones in the gallbladder (cholelithiasis) or inflammation of the gallbladder (cholecystitis). Ultrasound is the method of choice for this diagnosis with a sensitivity of 95–98% for gallbladder stones. It will also evaluate the pancreas and liver because biliary pathology is frequently associated with altered transaminases or elevated amylase.
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Scenario 2 — Elevated transaminases in blood tests
"The doctor told me that my liver enzymes are elevated and ordered an ultrasound to see what is going on with my liver."
The most frequent cause of elevated transaminases in Colombia is fatty liver (hepatic steatosis). Ultrasound detects it with high sensitivity — fatty liver appears hyperechoic (brighter than normal) compared to the kidney. It will also rule out hepatitis, cirrhosis, cysts, or liver masses that could explain the analytical alteration.
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Scenario 3 — Lower back pain or "kidney pain"
"I have pain in my lower back and they ordered a total abdominal ultrasound. Why do I also need the pelvic part?"
Lower back pain can be renal (nephritic colic due to a stone, infection, cyst), or it can originate in other pelvic structures. Ultrasound evaluates the kidneys looking for stones, hydronephrosis, or cysts, and adds the pelvic part to rule out gynecological or prostatic origin. A full bladder also helps to better see the lower part of the ureters.
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Scenario 4 — Routine control or check-up without specific symptoms
"I am fine, but my doctor ordered a total abdominal ultrasound as part of my annual check-up."
A full abdominal ultrasound as a preventive checkup can detect common silent conditions: fatty liver in people with overweight or diabetes, asymptomatic gallstones (10–15% of the Colombian adult population has them without knowing it), aortic aneurysm in older male smokers, renal cysts, or an enlarged prostate. Early diagnosis of these conditions changes management and prognosis.
5. The most common findings and what they mean
These are the findings that appear most frequently in abdominal ultrasound reports in Colombia, with their ultrasound description and clinical significance:
🫀 Fatty liver (hepatic steatosis)
Ultrasound description
Hyperechoic liver (brighter than normal), with increased posterior attenuation and loss of visibility of the wall of the portal vein and the hepatic veins. Frequently with mild hepatomegaly.
Clinical significance
Fat accumulation in hepatocytes. Associated with obesity, type 2 diabetes, dyslipidemia, alcohol consumption. It does not always cause symptoms. It can progress to nonalcoholic steatohepatitis (NASH) and cirrhosis if untreated.
→ Action: lifestyle changes, metabolic control, ultrasound follow-up
🟡 Cholelithiasis — gallstones
Ultrasound description
Hyperechoic (bright) images within the gallbladder lumen, with posterior acoustic shadowing (dark area behind). The stones are mobile with changes in position — they move with gravity.
Clinical significance
Present in 10–15% of adults. Most are asymptomatic. The risk of complications (biliary colic, cholecystitis, biliary pancreatitis) is 1–3% annually in asymptomatic patients. The decision to operate is based on symptoms.
→ Action: if asymptomatic, follow-up. If symptomatic, consider laparoscopic cholecystectomy
🫘 Renal lithiasis — kidney stones
Ultrasound description
Hyperechoic focus in the renal parenchyma or in the collecting system, with posterior acoustic shadowing. Hydronephrosis (dilation of the collecting system) accompanies the stone obstructing the ureter.
Clinical significance
Ureteral stones (those that cause colic) may not be visible on ultrasound if they are in the mid-ureter — non-contrast CT is more sensitive for this diagnosis. Ultrasound detects stones in the kidney and the resulting hydronephrosis well.
→ Action: if active colic with hydronephrosis, a CT may be needed. If asymptomatic, monitoring and hydration
🩷 Simple hepatic / renal cyst
Ultrasound description
Anechoic image (completely black, without internal echoes), thin well-defined wall, with posterior acoustic enhancement. Rounded or oval morphology.
Clinical significance
Simple liver and kidney cysts are completely benign — they do not require follow-up or treatment unless they are very large and compress adjacent structures. They are extremely common incidental findings in older adults.
→ Action: no action if simple. If it has septa, nodules, or Doppler flow → expand with CT
💧 Free abdominal fluid (ascites)
Ultrasound description
Free anechoic collection surrounding the organs, accumulating in the dependent spaces (Morison's space, splenorenal space, Douglas pouch in the pelvis). It moves with changes in position.
Clinical significance
Main causes: cirrhosis with portal hypertension (the most frequent), heart failure, nephrotic syndrome, peritonitis, peritoneal carcinomatosis. Ultrasound detects from 100 ml of free fluid — much more sensitive than the physical exam.
→ Action: refer urgently according to the clinical context — it may require diagnostic/therapeutic paracentesis
The quality of the diagnosis depends on the sonographer performing the study
A quality abdominal ultrasound requires equipment with a 3–5 MHz convex probe, color Doppler for vascular structures, and image compounding capability. At GSMED, we have abdominal ultrasound machines available in Colombia with local technical support.
6. When abdominal ultrasound is not enough — and what complement is needed
Clinical honesty requires recognizing the real limitations of abdominal ultrasound. There are situations in which ultrasound guides but is not sufficient for a definitive diagnosis:
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Ultrasound is sufficient
- Cholelithiasis — definitive diagnosis
- Simple hepatic or renal cyst
- Moderate-to-severe fatty liver
- Hydronephrosis — obstructive cause
- Splenomegaly — sizing
- Ascites — detection and quantification
- Aortic aneurysm — diameter
- Uterine fibroids — diagnosis
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CT is needed
- Ureteral stone in acute colic
- Appendicitis — better sensitivity
- Severe abdominal trauma
- Suspicious hepatic or renal mass
- Pancreas — visualization limited by gas
- Retroperitoneum and lymph nodes
- Intestinal obstruction
- Extension of neoplastic disease
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MRI is needed
- Characterization of indeterminate focal liver lesion
- MRI cholangiography (MRCP) — bile ducts
- Complex pancreatic pathology
- Deep endometriosis
- Complex renal pathology without contrast
- Follow-up of already known lesions
Intestinal gas: the greatest enemy of abdominal ultrasound Ultrasound waves do not pass through gas — they are completely reflected. Gas in the large intestine, small intestine, or stomach can block the visualization of the pancreas, abdominal aorta, and parts of the retroperitoneum. That is why fasting is critical: an empty stomach produces less gas than one that has just digested. In obese patients and in patients with a lot of chronic intestinal gas, some structures simply cannot be seen with ultrasound and require CT.
7. Frequently asked questions about full abdominal ultrasound
What if I couldn't fast completely? Can I still have the ultrasound?
It depends on what you ate and when. If you ate something small and at least 4 hours have passed, the technician can try the study — the gallbladder will be partially contracted but may still be visible. If you ate recently (less than 4 hours ago) or ate fatty foods, the gallbladder probably cannot be evaluated correctly and you will have to reschedule. Always notify the center before going if you couldn't fast — they will advise you if it makes sense to attend or reschedule.
Can I take my morning medications if I have to fast?
Yes. You can take your usual medications with the smallest possible sip of water. The most important exception is insulin — if you apply insulin and are not going to eat, consult your doctor beforehand about the schedule to follow that day to avoid hypoglycemia during the fast.
Can abdominal ultrasound detect cancer?
Ultrasound can detect masses or focal lesions in the liver, kidney, bladder, ovaries, and other organs that require additional study to determine if they are malignant. However, ultrasound does not diagnose cancer by itself — it characterizes the lesion and guides the need for a contrast CT, MRI, or biopsy. Some small or retroperitoneal cancers are not visible on ultrasound. A normal result does not completely rule out a neoplasm if symptoms persist.
How long do results take in Colombia?
In diagnostic centers in Colombia, the report is usually delivered on the same day or within the first 24 hours. The technician who performs the study can share general impressions, but the official report is signed by the radiologist or sonologist. If there is an urgent finding (large mass, massive ascites, large aneurysm), the doctor will contact the requester directly before issuing the formal report.
Is a full bladder necessary if the doctor only ordered an upper abdominal ultrasound?
No. If the doctor only requested an upper abdominal ultrasound (also written as "abdominal ultrasound" or "hepatic ultrasound"), you do not need to fill your bladder — only fast. A full bladder is necessary only when the study includes the pelvic part (uterus, ovaries, prostate, bladder). If you have doubts about what your medical order includes, call the diagnostic center before going to confirm the exact preparation.
How much does a full abdominal ultrasound cost in Colombia?
The cost varies significantly between SGSSS entities, private clinics, and independent diagnostic centers. In the health system (EPS/IPS), the cost is covered by the benefits plan when ordered by a doctor. In private consultation, prices in 2026 range from $80,000 to $250,000 COP depending on the type of institution and city. Some centers have different prices between "abdominal ultrasound" (upper only) and "full abdominal ultrasound" (with pelvic part) — check exactly what the fee includes before paying.
Ultrasound machines for quality abdominal diagnosis — available in Colombia
Systems with 3–5 MHz convex probes, vascular Doppler, and high resolution for abdominal ultrasound, available with local technical support and financing.
View abdominal ultrasound machines →
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