The Newfoundland Allergy Test detects high levels of allergy antibodies called immunoglobulin (IgE) in the blood. Elevated levels of IgE indicate an allergic reaction. The Newfoundland Allergy Test screens for allergies to cats, house dust mites and grass pollen, commonly known as hay fever. The test is for people who want to check for an allergy to cats, dust mites and grass pollen (hay fever).