Skin or blood
Skin testing involves placing drops of extracts of pollen
, animal dander, mold, dust mite
& food on your arms or back.
If allergic a small hive appears within 20 minutes. An alternative is rast, a blood test that detects the same allergy antibodies found with skin testing. Sometimes one test is needed to confirm the results of the other. Provocation tests are used in cases of "local" allergy.