Computed Tomography (CT) Scan of the Kidneys Without Contrast
A CT scan uses x-rays and computer images to examine the kidneys and surrounding areas without injected contrast, often to evaluate stones, obstruction, or other abnormalities.
["This noncontrast kidney CT creates detailed images to help evaluate urinary stones, blockages, cysts, and other kidney or abdominal findings."]
Key facts at a glance
- LOINC
- 43770-7
- Short code
- CT Kidney WO contr
- Synonyms
- CT Kidney WO contr
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What is this test?
A kidney CT scan is an imaging test that uses x-rays and a computer to create detailed pictures of the kidneys, ureters, and nearby abdominal structures. In this version, no intravenous contrast dye is injected.
Why might I need this test?
It may be ordered to evaluate kidney or urinary tract stones, a blockage or obstruction, unexplained abdominal or flank pain, trauma, or the cause of reduced urine production. It can also help characterize cysts, masses, or other abnormalities seen on other imaging.
How is the test performed?
You lie on a table while an x-ray machine rotates around you. The scan is quick and generally painless, although you may be asked to hold your breath briefly while images are taken.
How do I prepare for the test?
Because no contrast is used, there usually is no special preparation for the scan itself. Wear comfortable clothing without metal fasteners, remove jewelry or metallic items as instructed, and tell the imaging team if you are pregnant, have a history of contrast reactions, or have any other relevant medical conditions.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may indicate urinary stones, obstruction or fluid collection, kidney enlargement, cysts, tumors, injury, or other structural problems. The results are interpreted together with symptoms, examination findings, laboratory tests, and other imaging by your clinician.
Short name
Kidney CT Without Contrast
Frequently asked questions
Does this test use contrast dye?
Can this test detect kidney stones?
Is a kidney CT scan painful?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy