Aspergillus IgE

Function

The Aspergillus IgE test measures the level of Immunoglobulin E (IgE) antibodies in the blood specific to Aspergillus fumigatus, a common mold found both indoors and outdoors. IgE is the antibody responsible for type I hypersensitivity reactions (allergic reactions).

Why it is Ordered

Physicians order this test when a patient exhibits symptoms of respiratory distress, chronic coughing, or wheezing that may be related to mold exposure. It is particularly important for patients with asthma or cystic fibrosis who may develop a more severe reaction known as Allergic Bronchopulmonary Aspergillosis (ABPA). It helps differentiate between a simple mold allergy and more invasive fungal complications.

Associated Conditions

• Allergic Rhinitis: Classic hay fever symptoms caused by inhaling mold spores.
• Asthma: Aspergillus exposure can trigger or worsen asthmatic episodes.
• Allergic Bronchopulmonary Aspergillosis (ABPA): A condition where the immune system overreacts to the mold in the lungs, leading to inflammation and potential lung damage.
• Hypersensitivity Pneumonitis: Inflammation of the lung air sacs due to inhaled organic dust.

Summary

Positive results indicate sensitization to Aspergillus. However, a positive test does not automatically mean a person has a clinical allergy; it must be correlated with physical symptoms and exposure history. For those with chronic lung diseases, this test is a vital component of ongoing pulmonary management.