Fast Five Quiz: Allergic Asthma Presentation and Diagnosis

Zab Mosenifar, MD


September 11, 2019

CT scans of the sinuses should be considered when patients have signs and symptoms of chronic sinusitis. About two thirds of patients with severe asthma also have chronic sinusitis.

Allergen-inhalation tests are not always indicated when allergic asthma is suspected and are generally not needed or recommended.

Although an allergen avoidance trial can be diagnostic, it is difficult, if not impossible, to avoid most allergens completely; thus, failure to improve with an attempt at allergen avoidance cannot rule out the presence of an allergy to those allergens.

Skin testing is more specific, more sensitive, and typically less expensive than blood tests (in vitro) for allergen-specific IgE. However, blood tests such as the radioallergosorbent test may be used instead of skin testing if dermatologic disease is generalized, if antihistamine use cannot be halted (which affects skin testing but not in vitro testing), or if skin testing is relatively contraindicated.

Learn more about the diagnosis of allergic asthma.


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