My son (4) had an ige level of 1400 (high) what could cause this? he does have eczema and had a few environmental and good allergies.

Consider testing: The ige level that was measured is considered to be extremely high. If your son has pulmonary symptoms, a chest radiograph may be ordered by your physician to document structural changes in the airways. There is a condition called abpa which afffects about 10% of asthmatics and CF patients. Airway fungal sensitization can be measured and tests ordered to detect reactions to fungi as well.