What it is (overview)

A CT Abdomen High Resolution (Triple Phase)—also called a triphasic CT abdomen—is an advanced diagnostic imaging test that uses X-rays and computer processing to create detailed, cross-sectional pictures of your abdominal organs (such as the liver, pancreas, kidneys, spleen, adrenal glands, and major blood vessels). “High resolution” means the images are very detailed, which can help radiology specialists identify small or subtle abnormalities.

“Triple phase” refers to taking images at three timed points after an iodine-based contrast dye is injected into a vein. These phases show how blood flows through abdominal tissues and vessels:

• Arterial phase: Highlights arteries and certain tumors that get blood supply early.
• Portal venous phase: Commonly provides the best overall view of abdominal organs and many lesions.
• Delayed (equilibrium) phase: Helps characterize specific findings (for example, some liver lesions or urinary tract evaluation) and can clarify scarring vs. active disease.

This CT scan doesn’t “measure” a blood level like a lab test; instead, it measures and visualizes anatomy and blood flow patterns—including organ size and shape, the presence of masses, inflammation, bleeding, blockages, and vascular issues (problems involving arteries and veins).

What results can mean: A radiologist interprets the images and provides a report. Results may show a normal abdomen, or findings such as a tumor or cyst, signs of inflammation or infection, internal bleeding, stones, or narrowed/blocked blood vessels. The “phase” in which something appears (or how it enhances with contrast) often helps determine whether a finding is benign vs. suspicious and guides next steps such as follow-up imaging, biopsy, referral to a specialist, or treatment planning.

When & why it's usually done

Doctors commonly order a high-resolution triphasic CT scan of the abdomen when they need a very detailed look at organs and blood vessels—especially when standard imaging isn’t enough or when the pattern of contrast enhancement is important for diagnosis. It is frequently used in radiology to evaluate both urgent and non-urgent concerns.

This test may be recommended if you have symptoms such as:

• Persistent or severe abdominal pain, especially when the cause is unclear
• Unexplained weight loss, loss of appetite, or ongoing fatigue
• Jaundice (yellowing of the skin/eyes), dark urine, or pale stools suggesting bile duct or liver problems
• Fever with suspected abdominal infection or abscess
• Abdominal swelling, a new lump, or unexplained fluid (ascites)
• Blood in the urine or concern for kidney/urinary tract issues (in selected protocols)

It is also commonly done to:

• Evaluate a suspected mass or cancer (for example, liver, pancreas, kidney, adrenal, or metastatic disease) and help determine its size, location, and blood supply
• Characterize liver lesions found on ultrasound or another CT scan (triphasic imaging is especially helpful for distinguishing different types of liver tumors)
• Assess vascular issues such as aneurysm, arterial narrowing, thrombosis (clot), or bleeding
• Check for complications of inflammation (such as pancreatitis complications, abscesses, or bowel-related inflammation depending on the clinical question)
• Stage cancer (see whether disease has spread) and guide treatment planning, surgery planning, or interventional radiology procedures
• Monitor response to treatment (chemotherapy, ablation, embolization) or follow known lesions over time

Important considerations: This is a CT scan that uses ionizing radiation and typically uses IV contrast. Tell your care team if you have a history of contrast allergy, asthma, kidney disease, dehydration, or are pregnant or may be pregnant. Your clinician may check kidney function beforehand and provide instructions about eating, drinking, and certain medications.

Common diseases related to it

• Liver tumors (including hepatocellular carcinoma) and liver metastases
• Benign liver lesions (such as hemangioma, focal nodular hyperplasia, hepatic adenoma)
• Pancreatic cancer and complications of pancreatitis
• Kidney tumors (renal cell carcinoma) and complex kidney cysts
• Adrenal nodules (adenoma vs. other adrenal masses)
• Abdominal aortic aneurysm and other arterial aneurysms
• Arterial stenosis/occlusion and ischemia (reduced blood flow)
• Venous thrombosis (for example, portal vein thrombosis)
• Intra-abdominal infection or abscess
• Inflammatory conditions affecting abdominal organs (organ inflammation, selected bowel inflammation)
• Trauma-related internal bleeding or organ injury (when appropriate for the clinical scenario)

Health goals where it may help

• Finding the cause of unexplained abdominal pain with high-resolution imaging
• Early detection and characterization of tumors in abdominal organs
• Monitoring known lesions (such as liver or kidney masses) for growth or change
• Assessing liver health and evaluating suspicious liver findings seen on ultrasound or prior imaging
• Evaluating and monitoring vascular health in the abdomen (aneurysm, clots, abnormal blood flow)
• Supporting cancer care goals such as staging, treatment planning, and tracking treatment response
• Clarifying unclear results from other tests to reduce uncertainty and guide next steps with your care team