Skin prick test (SPT) and an allergy blood test (RAST/ImmunoCAP) are two common methods of allergy testing used for diagnosis. Both tests have their own advantages and disadvantages:   Pros of skin prick test: It is relatively inexpensive and easy to perform. Results are available quickly, usually within 15-20 minutes. It is a highly sensitive test, meaning that it can detect even small amounts of allergens. It can test for a wide range of allergens at once. Cons of skin prick test: It can cause mild discomfort or pain during the test. It can cause a minor allergic reaction at the test site. It may not be as specific as a blood test and may produce false positive results. Pros of blood test for allergies: It is a less invasive procedure as it only requires a blood sample. It can test for a wide range of allergens at once. It is more specific than skin prick test, meaning that it is less likely to produce false positive results. Cons of blood test for allergies: It is more expensive than a skin prick test. Results take longer to get, usually a few days. It is less sensitive than skin prick test, meaning that it may not detect low levels of allergens. Both tests are useful and accurate, but the choice of test will depend on factors such as cost, availability, and the patient's preferences. Speak with your doctor to decide which allergy testing procedures are appropriate for you.