An 8-year-old patient presents to her pediatrician complaining of profuse, watery rhinorrhea, difficulty breathing, and itching of the nose and palate. There is a family history of atopy. During the physical examination, the child has paroxysmal sneezing. The physician suspects that the patient has allergic rhinitis. To substantiate the diagnosis, the physician should perform which of the following tests?
(A) A radioallergosorbent test (RAST)
(B) A Coombs’ test
(C) A nasal smear for eosinophils
(D) A scratch test
(E) Immunoglobulin E (IgE) levels
(A) A radioallergosorbent test (RAST)
(B) A Coombs’ test
(C) A nasal smear for eosinophils
(D) A scratch test
(E) Immunoglobulin E (IgE) levels