subject: Countdown to Flu 2010: Flu vs. Sinusitis [print this page] The most definitive way to determine the difference between the flu and sinusitis is to get a flu swab test and either a physical exam suggestive of sinus pain, or a CT scan to visualize the sinus cavities and see if they are filled with fluid. These tests can be found at urgent care clinics, emergency departments, or with referral from your primary care doctor's office. You can use iTriage to find these providers anywhere in the United States.
