Test Details: The Allergen - Cottonwood Tree Pollen Test, is a blood test specifically designed to determine if an individual is allergic to cottonwood tree pollen. The immune system in allergic individuals recognizes cottonwood pollen as a threat, leading to an excessive immune response marked by the production of Immunoglobulin E (IgE) antibodies. These IgE antibodies specifically target cottonwood pollen, and their levels can be detected and measured using this test.