Skin prick tests and blood draw tests are both used to check for allergens. The skin prick test is an in vivo test and the blood test is an ex vivo test. The skin prick test can be given if the patient has not taken oral antihistamines or glucocorticoids in the last week and is not allergic. If the patient is currently taking medication or is older, younger, or currently allergic, it is preferable to have a blood test for allergens, which is more direct and accurate than the prick test for allergens. However, there is a risk of allergic reactions to allergens in prick tests, so it is important to follow your doctor’s instructions and choose a test that suits your needs.