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Computed Tomography (CT) Scan of the Chest Without Contrast

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

A CT scan creates detailed cross-sectional images of the chest to evaluate lung, airway, bone, and other chest structures without using IV contrast.

Quick summary

["A chest CT without contrast provides detailed images of the chest without the need for injected contrast dye."]

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

Key facts at a glance

LOINC
47366-0
Short code
CT Chest Ltd WO contr
Synonyms
CT Chest Ltd 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 chest CT is an imaging test that uses multiple X-ray measurements and a computer to create detailed pictures of the chest. This version is performed without intravenous contrast dye.

Why might I need this test?

A chest CT may be used to investigate unexplained symptoms, evaluate an abnormality found on another imaging test, or assess conditions affecting the lungs, airways, blood vessels, bones, or soft tissues of the chest.

How is the test performed?

You will lie on a table that moves through a doughnut-shaped CT scanner. The scanner takes X-ray images from different angles, and a radiologist reviews them. The scan usually takes only a few minutes, and you may be asked to hold your breath briefly.

How do I prepare for the test?

No contrast dye or fasting is usually required. Wear loose, metal-free clothing and tell the technologist if you are pregnant, may be pregnant, or have trouble lying still. Remove jewelry and other metal objects as instructed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Chest CT Without Contrast

Frequently asked questions

Does this test use contrast dye?
No. This is a non-contrast CT scan, so no IV contrast is injected. It is different from a chest CT with contrast.
Is a chest CT the same as a standard chest X-ray?
No. A CT provides many detailed cross-sectional images and generally shows more structural detail than a standard chest X-ray, although it involves more radiation.
Will I be able to drive home after the test?
Usually, yes. Because no contrast is used and no sedation is normally given, you can generally resume your usual activities immediately after the scan.
  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