How can I know if I am suffering from Allergic Rhinitis? How is Allergic Rhinitis diagnosed? Diagnosis is usually based on your history of symptoms. Your doctor will perform a physical exam and ask you questions about your symptoms. You will be asked about exposure to allergens and whether your symptoms vary by time of day or season. A family history can usually be elicited. Skin tests and blood tests help in diagnosing the condition and detecting the allergen. . In skin test your doctor will prick your skin with a small amount of suspected allergy-causing substances and watch for