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Maxillary Sinus Air-Filled Volume (by Computed Tomography)

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

This test measures how much air is present in your maxillary sinus (the sinus above your upper teeth) using a CT scan. It helps assess sinus health and rule out conditions like sinusitis or structural issues.

Quick summary

["A CT scan checks for air in your sinus cavities to identify potential blockages or infections."]

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

Key facts at a glance

LOINC
41808-7
Short code
CT Maxillofacial
Synonyms
CT Maxillofacial
Category
chemistry
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 a Maxillary Sinus Air-Filled Volume Test Used For?

Doctors may order this test to diagnose or monitor conditions such as chronic sinusitis, nasal polyps, or structural abnormalities like deviated septums. It’s also used before certain sinus surgeries to ensure proper anatomy and planning.

How Is the Test Performed?

You’ll lie down on a table while a CT machine takes detailed images of your sinuses. No special preparation is needed, but you may be asked to hold your breath briefly during the scan. A contrast dye might be used in some cases to enhance visibility.

What Are Common Reasons for This Test?

Common reasons include persistent sinus symptoms (like pressure, pain, or congestion), recurrent sinus infections, or if your doctor suspects a structural issue affecting airflow in your sinuses.

How Do Results Relate to Sinus Health?

Results show whether your maxillary sinus is fully air-filled (normal) or partially filled with fluid or tissue (which may indicate inflammation, infection, or blockage). A lower air volume could signal sinusitis, polyps, or other issues needing further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Max Sinus Air Volume

Frequently asked questions

Why might my doctor recommend this test?
Your doctor may recommend it if you have symptoms like chronic sinus congestion, facial pain, or a history of recurrent sinus infections. It helps visualize the sinus anatomy to check for blockages or structural issues that could be causing your symptoms.
What does a low or high air volume mean?
A low air volume (partial filling) often suggests sinus inflammation, infection, or fluid buildup, which may require treatment like antibiotics or nasal irrigation. A high air volume (fully filled) usually indicates no blockage, but further evaluation may still be needed if you have ongoing symptoms.
Do I need to prepare for this test?
No special preparation is needed. You may be asked to remove any metal objects (like jewelry or glasses) to avoid interference with the scan. Follow your doctor’s instructions if contrast dye is used, such as drinking plenty of fluids afterward.
  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