Accurate history of symptoms correlated with time of seasonal pollination of plants in a given locale; special attention must be paid to other potentially sensitizing antigens such as materials associated with pets, e.g., dander.

• Physical examination: nasal mucosa may be boggy or erythematous; nasal polyps may be present; conjunctivae may be inflamed or edematous; manifestations of other allergic conditions (e.g., asthma, eczema) may be present.
• Skin tests to inhalant and/or food antigens.
• Nasal smear may reveal large numbers of eosinophils; presence of neutrophils may suggest infection.
• Total and specific serum IgE (as assessed by immunoassay) may be elevated.