ALLERGY, ASPERGILLUS FUMIGATUS

Aspergillus fumigatus is a common environmental fungus whose spores are in the air everywhere. In most people they cause no problem, but in some the immune system reacts allergically to them. This blood test measures specific IgE antibodies against Aspergillus — evidence that the immune system is sensitised to it.

It is best known as part of the workup for ABPA (allergic bronchopulmonary aspergillosis), a condition seen in people with asthma or cystic fibrosis whose lungs react strongly to this fungus. The test is interpreted together with total IgE, chest imaging and lung function.

When do doctors advise this test?

• Asthma that is severe, worsening or not responding as expected
• Suspected ABPA in asthma or cystic fibrosis patients
• Repeated chest infections or mucus plugging under evaluation
• As part of a broader allergy panel advised by a chest physician or allergist

Preparation & the sample

No fasting is needed, and — unlike skin-prick testing — blood IgE tests are not affected by antihistamine medicines, so you do not need to stop them. Inform the team about any ongoing treatment when you book.

This information is educational and general. Your doctor's advice for your specific situation always comes first.