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.
Intradermal test: If your skin prick test was negative, your doctor may try an intradermal test. In this test, your doctor injects the allergen into your skin. Intradermal allergy tests are often used for environmental allergies and drug allergies. Doctors usually don't use this type of allergy test with food or latex allergies.