Allergy Bay leaf test is performed on a blood sample to measure the level of IgE Antibodies in the blood. It is performed to confirm the Bay leaf Laurus Nobilis Allergy during and after the treatment of the same. Bayleaf is widely used as a natural remedy for many problems but it has side-effects that may be fatal on excess use of it. It may cause problems in pregnancy, may increase hypoglycemic effects and due to which cause insulin. In rare cases, it causes asthma too.