Skin test: Your doctor will use a concentrated liquid form of common allergens on your skin and evaluate if and how severely your skin responds. In most situations, a skin test is the quickest, most accurate method of allergy testing as it can detect more subtle allergies.
Blood test: This type of allergy test is useful when diagnosing a food allergy, or when a skin test is not possible. The doctor will take a sample of your blood and send it to be tested for any reactions to common food allergens.
Challenge test: Another way to diagnose food allergies, challenge tests require you to eliminate certain foods from your diet that may be triggering an immune response.