The other sort of test that we do is a blood test. The blood tests are simpler to do, because it just requires taking a small sample of blood, but the person doesn't get it back right away. They have to go off to the lab. What we're looking for are the levels of the antibodies in the blood against the allergens that we're testing for. Again, we give the lab a list of perhaps half a dozen of our number one suspects and they come back and they tell us the levels of antibody against each of them and then we can use that to confirm the clinical impression that the person is sensitive to a particular thing.