Diagnosis of sinusitis is usually based on your medical history and physical exam. A detailed history of the problem often can be of more value to the diagnosis than a physical exam. If the symptoms and physical findings are typical of sinusitis, further testing is usually not needed.
Sinus X-ray, which may be done to confirm a suspected case of sinusitis. An X-ray produces a picture of dense tissues inside the body. But a CT scan provides better information.
Less often, other tests may be done by an ear, nose, and throat (ENT) specialist (also called an otolaryngologist) or by an allergist. These tests may include:
An endoscopic sinus exam (ESM)(nasal endoscopy). An ESM uses a lighted viewing instrument called an endoscopeto view structures inside your nose and sinus cavities. ESM is used to evaluate chronic sinusitis.