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CT Sinuses, Limited, Without Contrast

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

A limited CT scan of the paranasal sinuses that does not use injected contrast to produce detailed images of the sinus cavities.

Quick summary

["This test uses X-ray images to evaluate the paranasal sinuses and may help identify inflammation, infection, polyps, or obstruction."]

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

Key facts at a glance

LOINC
46304-2
Short code
CT Sinuses Ltd WO contr
Synonyms
CT Sinuses 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?

This is a limited computed tomography (CT) scan of the paranasal sinuses, the air-filled spaces around the nose. It creates detailed X-ray images to assess the sinus cavities and nearby structures without injected contrast.

Why might I need this test?

A sinus CT may be ordered for persistent or severe sinus symptoms, such as congestion, facial pain, headache, or thick nasal discharge. It can also help evaluate suspected inflammation, infection, nasal polyps, or sinus blockage when an initial examination is not sufficient.

How is the test performed?

You will lie on a CT table while the scanner rotates around your head. The scan is usually brief, and the technologist may ask you to remain still and avoid swallowing during image capture.

How do I prepare for the test?

No fasting or blood draw is generally required. Remove items that contain metal, including jewelry, hairpins, and removable dental appliances, if instructed; tell the care team if you are pregnant, may be pregnant, or have a contrast allergy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate sinus inflammation, infection, fluid or mucus buildup, polyps, narrowing, or another structural problem. The radiologist interprets the images along with your symptoms and examination, so results should be discussed with your clinician.

Short name

Limited sinus CT

Frequently asked questions

Is this the same as a routine head CT?
No. This is a focused, limited scan of the sinus area rather than a CT of the entire head.
Will I receive contrast dye?
This test is performed without injected contrast, so there is generally no need for an IV line or a contrast-related wait period.
Does a CT scan diagnose a sinus infection by itself?
It can show signs consistent with sinus infection, but the findings must be interpreted with your symptoms, examination, and medical history.
  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