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.
A. INSTRUCTIONS FOR ALLERGY SKIN TESTING. Skin testing is a procedure that helps identify substances (allergens) that cause an allergic reaction. Drops of allergy extracts are applied to the skin of your forearm or upper back with a sterile, disposable plastic device that pricks the outer surface of your skin. You will be asked to wait approximately 15 minutes so that reactions to the skin test can be evaluated.