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X-ray Tomogram of the Kidney with Intravenous Contrast

Published: August 9, 2026Updated: August 16, 2026

An imaging test that takes detailed pictures of the kidneys after intravenous contrast is given to help assess the kidneys and urinary tract.

Quick summary

["This test uses contrast-enhanced imaging to help identify problems affecting the kidneys or urinary tract."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
24790-8
Short code
XR tomo Kdny-Bl W contr IV
Synonyms
XR tomo Kdny-Bl W contr IV
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr-tomography
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?

This is an X-ray-based imaging test of the kidneys. Intravenous contrast is given through a vein to make the kidneys and nearby blood vessels easier to see on the pictures.

Why might I need this test?

It may be ordered to investigate kidney stones, urinary tract obstruction, changes in kidney structure, unexplained pain, or other suspected conditions. It may also help assess how the kidneys are functioning and how urine is draining.

How is the test performed?

An imaging technologist places an intravenous line in your arm or hand and administers the contrast. Several pictures are then taken while you lie still on the scanning table. The procedure is generally painless, although the injection may cause a brief warm or flushing sensation.

How do I prepare for the test?

Follow the facility's instructions, as fasting or medication adjustments may be required in some cases. Tell the care team if you have previously had a reaction to contrast, have kidney disease, are pregnant or might be pregnant, or take medicines such as metformin.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Kidney X-ray with IV contrast

Frequently asked questions

Is this the same as a standard kidney X-ray?
It is an X-ray-based imaging study that may provide more detailed pictures than a plain X-ray. Intravenous contrast is used to improve the visibility of the kidneys and blood vessels.
Does the contrast injection hurt?
The injection is usually only briefly uncomfortable. Some people notice a warm sensation, a metallic taste, or mild flushing, but serious reactions are uncommon.
Will I need someone to drive me home?
Many people can return to normal activities after the test, but the facility may recommend transportation if you received sedating medication or had a contrast reaction. Ask the imaging center for its specific instructions.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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