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Tests and diagnosis

By Mayo Clinic staff

Your doctor may use several methods to help screen for acute sinusitis, such as:

  • Physical exam. To look for the cause of your symptoms, your doctor will feel for tenderness in your nose or throat. Your doctor may use a tool to hold your nose open and apply medication that constricts blood vessels in your nasal passages. This makes it easier to see inside your nasal passages. Your doctor will then shine a light into your nasal passages to look for inflammation or fluid. This visual inspection will also help rule out physical conditions that trigger sinusitis, such as nasal polyps or other abnormalities.
  • Nasal endoscopy. A thin, flexible tube (endoscope) with a fiber-optic light inserted through your nose allows your doctor to visually inspect the inside of your sinuses.
  • Imaging studies. Images taken using computerized tomography (CT) or magnetic resonance imaging (MRI) can show details of your sinuses and nasal area. These may identify a deep inflammation or physical obstruction that's difficult to detect using an endoscope.
  • Nasal and sinus cultures. Laboratory tests are generally unnecessary for diagnosing acute sinusitis. However, in cases in which the condition fails to respond to treatment or is progressing, tissue cultures may help pinpoint the cause, such as identifying a bacterial cause.
  • Allergy testing. If your doctor suspects that the condition may be brought on by allergies, an allergy skin test may be recommended. A skin test is safe and quick, and can help pinpoint the allergen that's responsible for your nasal flare-ups.
Treatments and drugs Preparing for your appointment
References
  1. Hwang PH, et al. Acute sinusitis and rhinosinusitis in adults. http://www.uptodate.com/home/index.html. Accessed Aug. 10, 2010.
  2. Sinus infection (sinusitis). National Institute of Allergy and Infectious Diseases. http://www.niaid.nih.gov/topics/sinusitis/Pages/Index.aspx. Accessed Aug. 10, 2010.
  3. Leung RS, et al. The diagnosis and management of acute and chronic sinusitis. Primary Care: Clinics in Office Practice. 2008;35:11.
  4. Tips to remember: Sinusitis. American Academy of Allergy, Asthma & Immunology. http://www.aaaai.org/patients/publicedmat/tips/sinusitis.stm. Accessed Aug. 10, 2010.
  5. Joint Task Force on Practice Parameters for Allergy and Immunology. The diagnosis and management of sinusitis: A practice parameter update. Journal of Allergy and Clinical Immunology. 2005;116(suppl):13.
  6. Dykewicz MS, et al. Rhinitis and sinusitis. Journal of Allergy and Clinical Immunology. 2010;125(suppl):103.
  7. Fact sheet: 20 questions about your sinuses. American Academy of Otolaryngology — Head and Neck Surgery. http://www.entnet.org/HealthInformation/sinuses.cfm. Accessed Aug. 10, 2010.
  8. Sinusitis. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Aug. 11, 2010.
  9. Sinupret. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Aug. 13, 2010.
  10. SinuComp. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Aug. 13, 2010.
  11. Naegleria FAQs. Centers for Disease Control and Prevention. http://www.cdc.gov/parasites/naegleria/faqs.html. Accessed Dec. 30, 2011.
DS00170 Jan. 20, 2012

© 1998-2013 Mayo Foundation for Medical Education and Research (MFMER). All rights reserved. A single copy of these materials may be reprinted for noncommercial personal use only. "Mayo," "Mayo Clinic," "MayoClinic.com," "EmbodyHealth," "Enhance your life," and the triple-shield Mayo Clinic logo are trademarks of Mayo Foundation for Medical Education and Research.

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