In anatomical sources, the aorta is usually divided into sections. One way of classifying a part of the aorta is by anatomical compartment, where the thoracic aorta (or thoracic portion of the aorta) runs from the heart to the diaphragm. The aorta then continues downward as the abdominal aorta (or abdominal portion of the aorta) diaphragm to the aortic bifurcation.
You can perform an allergy skin test on infants as young as six months, but they're not considered totally reliable in kids younger than two years old. Before going ahead with any type of skin test, a doctor usually takes a few factors into account.
Allergy tests for allergic asthma. If your child seems to have asthma that's triggered by allergies, the doctor may want to do allergy skin testing. During a skin test, the skin is pricked with extracts of common allergy-causing substances, such as animal dander, mold or dust mites, and observed for signs of an allergic reaction.