RECURRENT INFECTIONS, most commonly manifesting as recurrent sinus, lung, and occasionally ear infections, may sometimes look a lot like respiratory allergies and/or asthma. When suspicion for immune deficiency arises, diagnostic testing can be done, most of which is accomplished by blood testing. Various facets of the immune response, especially antibody levels and white blood cell numbers and types, can be assayed. Significant immune deficiency is very uncommon, however, and if your screening is distinctly abnormal, we would likely refer you to a tertiary center for even more extensive work-up and treatment.