Imutest Self Test for Allergies CatImutest to detect allergy, based on IgE antibodies, is intended for all persons who suspect an undesirable allergic reaction to cats. Imutest is used as an aid in the diagnosis of increased sensitivity to this allergen. Only a small blood sample is needed to perform the test, the acquisition of which is hygienic and minimally unpleasant. In allergy, the immune system reacts to contact with alegen by producing IgE antibodies. Imutest to determine