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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 images of the chest to evaluate the lungs and other structures without using intravenous contrast dye.

Quick summary

["This imaging test can identify abnormalities in the lungs and chest, but it does not use intravenous contrast dye."]

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

Key facts at a glance

LOINC
29252-4
Short code
CT Chest WO contr
Synonyms
CT Chest 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 without contrast is a computed tomography scan that creates detailed cross-sectional images of the lungs and other parts of the chest. “Without contrast” usually means no intravenous iodinated contrast dye is given.

Why might I need this test?

Your clinician may order this test to investigate unexplained chest pain, coughing, shortness of breath, fever, or abnormal chest findings. It may also be used to evaluate lung conditions, infections, injuries, or the spread of disease.

How is the test performed?

You lie on a table while an X-ray machine rotates around your chest. The scan is quick and generally painless, although the enclosed scanner can feel confining. The technologist may ask you to hold your breath briefly for clearer images.

How do I prepare for the test?

A CT scan without contrast usually requires no fasting, medication changes, or special preparation. Wear comfortable clothing without metal fasteners and tell the technologist if you are pregnant, may be pregnant, or have mobility or claustrophobia concerns.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT Chest Without Contrast

Frequently asked questions

Does this test use contrast dye?
No intravenous contrast dye is typically used for a CT chest without contrast. If an oral contrast agent is planned, the imaging facility should tell you before the appointment.
Is a CT chest scan the same as a standard chest X-ray?
No. A CT scan provides many more detailed cross-sectional images than a standard chest X-ray, so it can show smaller or more precisely defined abnormalities.
Will I need someone to drive me home?
Usually not, because contrast is not used and no sedation is normally given. If you have received sedatives for another reason or your facility requires an escort, follow their 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