Evaluating Your Sinuses: Diagnostic Tests

Imaging tests can help your doctor learn more about your sinuses. Find out about the tests you may have to confirm your diagnosis.

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Imaging tests can help your doctor learn more about your sinuses. You may have tests to confirm your diagnosis.

Diagnostic tests

CT scan of deviated septum and blocked sinus (front view). CT scan of blocked sinus (cross section from above).

  • CT scan. This is a special kind of X-ray. It gives a detailed view of your nose and sinuses. Scans from different angles help show the exact place where the blockages are. They also serve as “maps” during surgery. In some cases, you may need more than one CT scan before your surgery.
  • Nasal endoscopy. This is a procedure that uses a slim, flexible tube with a fiberoptic light at the end. This is called an endoscope. The doctor puts the endoscope into your nose. This lets your doctor see the inside of your nose, including the nasal mucosa and sinus openings. If needed, your doctor can also take tissue samples (biopsies) through the endoscope. These samples will be looked at by a lab.
  • Allergy tests. You may have these types of tests to find out what things you're allergic to. You may be allergic to food, latex, pollen, mold, pet dander, or other environmental substances.
  • Mucus sample. The doctor may take these samples from your nose or sinuses to check for infection.

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