You must ensure your husband visits an Allergy specialist for specific IgE tests against aeroallergens.
The raised eosinophilia
can also be due to uncontrolled asthma and therefore a follow up lung function test will be required.
Depending on the allergy results, he may have allergic asthma
or non-allergic rhinitis
with intrinsic asthma and will require long actin antihistamines with nasonex nasal spray
for the rhinitis.
The asthma control needs to be reviewed with the Asthma questionnaire, and inhalers adjusted as per the lung function tests or the questionnaire.