A healthcare provider can diagnose acute tonsillitis based on the person's health history and a physical exam. A throat culture can help identify the organism causing the infection. A complete blood count, or CBC, can also help determine if the infection is caused by a virus or bacteria.
If mononucleosis is involved, the lymph nodes in the neck, armpit, or groin will be enlarged. An antibody titer may be done to check for antibodies to the Epstein-Barr virus.
A healthcare provider can diagnose subacute tonsillitis and chronic tonsillitis based on a person's health record and a physical exam.