What it is (overview)

A CT Abdomen Upper without IV Contrast (also called a non-contrast CT scan of the upper abdomen) is a diagnostic imaging test that uses X-rays and computer processing to create detailed, cross-sectional pictures of the upper part of your belly. This area typically includes the liver, gallbladder, bile ducts, pancreas, spleen, stomach, parts of the small intestine and colon, major blood vessels, lymph nodes, and the upper portions of the kidneys.

Because this study is done without intravenous (IV) contrast, no contrast dye is injected into a vein. That can be helpful for people who cannot receive contrast due to kidney problems, a prior contrast allergy, pregnancy-related precautions (when CT is still deemed necessary), or when the clinician is specifically looking for findings that are well seen without dye (for example, certain types of bleeding, calcifications, or some stones).

What it “measures”: A CT scan does not measure a blood level or hormone. Instead, it evaluates the size, shape, and density of organs and tissues. It can show inflammation, swelling, fluid collections, abnormal masses, enlarged organs, and some types of injury. It can also detect calcifications (such as certain gallstones) and signs of obstruction in the gastrointestinal tract.

What the results can mean (in plain language): Your radiology report may state that the study is normal (no concerning abnormality seen), or it may describe findings such as an enlarged liver, evidence of inflammation, a mass (which may be benign or suspicious), fluid around an organ, or changes suggesting infection or injury. Because there is no IV contrast, some problems—especially those involving blood vessels or subtle differences between normal and abnormal tissue—may be harder to characterize. In those cases, your clinician may recommend a follow-up test such as a contrast-enhanced CT, MRI, or ultrasound for clarification.

When & why it's usually done

Doctors commonly order an upper abdomen CT scan without contrast to help evaluate symptoms or conditions affecting organs like the liver and pancreas, especially when a fast and detailed look is needed or when IV contrast is not appropriate.

This test may be recommended for:

Symptoms that need evaluation

• Upper abdominal pain (right-sided pain, mid-upper belly pain, or pain that may radiate to the back)
• Nausea, vomiting, or unexplained loss of appetite when an abdominal cause is suspected
• Bloating or concern for bowel obstruction (in select situations)
• Fever with concern for an abdominal infection or inflammation
• Unexplained weight loss when evaluating for masses or other abdominal disease

Medical reasons and risk factors

• To look for or follow known or suspected tumors/masses in the liver, pancreas, stomach, or spleen
• To assess pancreatitis or complications when contrast cannot be used (recognizing that contrast CT is often preferred for certain questions)
• To evaluate the abdomen after trauma when IV contrast is not possible
• To check for fluid collections, inflammation, or enlarged lymph nodes
• When a patient has reduced kidney function or a history of significant contrast reaction, making a non-contrast CT a safer option
• To identify calcifications (for example, pancreatic calcifications in chronic pancreatitis or calcified lesions)

Depending on your symptoms, your clinician may compare this CT scan with prior imaging or order additional tests (blood work, ultrasound, or MRI) to fully explain the cause of symptoms like abdominal pain.

Common diseases related to it

• Liver conditions (fatty liver disease, cirrhosis, liver enlargement, liver masses)
• Pancreatitis (acute or chronic) and pancreatic calcifications
• Pancreatic tumors or suspected pancreatic mass (may require contrast CT or MRI for full characterization)
• Gallbladder disease (some gallstones, gallbladder inflammation—often better evaluated with ultrasound)
• Abdominal tumors (including masses involving the stomach, liver, pancreas, or lymph nodes)
• Splenic conditions (splenomegaly, splenic lesions, injury—contrast may be needed for some trauma questions)
• Abdominal infections/inflammation (abscess or inflammatory changes—contrast often improves detection)
• Bowel obstruction or certain gastrointestinal inflammatory processes
• Abdominal aortic aneurysm calcification or vascular calcifications (non-contrast can show calcified plaque; contrast is needed for many vascular details)

Health goals where it may help

• Finding the cause of upper abdominal pain to guide timely treatment
• Checking liver health (monitoring known liver disease, evaluating liver enlargement or suspected lesions)
• Assessing pancreatic health (supporting diagnosis or follow-up of pancreatitis or suspected pancreatic abnormalities)
• Evaluating for tumors or monitoring known masses in the upper abdomen
• Monitoring recovery after injury or checking for complications when contrast cannot be used
• Planning next steps (deciding whether ultrasound, MRI, or contrast-enhanced CT is needed for a clearer answer)