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CT Scan of Lung Parenchyma Without Contrast

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

A CT scan uses X-rays and a computer to create detailed images of the lung tissue without injecting IV contrast dye.

Quick summary

["This scan provides detailed images of the lungs to help evaluate infection, inflammation, lung disease, and suspicious abnormalities."]

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

Key facts at a glance

LOINC
37441-3
Short code
CT Lung parenchyma WO contr
Synonyms
CT Lung parenchyma 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 lung CT scan, also called computed tomography, creates cross-sectional images of the chest. In this version, no intravenous contrast dye is injected.

Why might I need this test?

Your clinician may order this test to investigate unexplained symptoms such as cough, fever, shortness of breath, or chest pain. It can also help assess known lung disease or evaluate an abnormal chest X-ray.

How is the test performed?

You lie on a table that moves through a scanner while X-ray images are taken. The scan is painless and usually takes only a few minutes, although you may be asked to hold your breath briefly.

How do I prepare for the test?

Follow the instructions provided by your imaging facility. Remove metal objects and tell the technologist if you are pregnant, have a history of contrast reactions, or have trouble lying flat. No fasting is usually required for a scan without contrast.

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 CT scan use contrast dye?
No. “Without contrast” means no IV contrast dye is injected for this examination.
Is a CT scan of the lungs painful?
The scan itself is generally painless. You may be asked to lie still and briefly hold your breath while the images are taken.
Will this test show all causes of breathing problems?
No. It provides detailed images of the lungs and chest, but breathing problems can also involve the airways, heart, muscles, blood, or other systems. Your clinician may recommend additional tests based on the results.
  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