Immunodeficiency consists of a dysfunction of the immune system, which results in the appearance and recurrence of infections with a higher frequency than usual, in addition to being much longer and severe. Common immunodeficiency variable can be diagnosed once the defective functional antibody formation is obtained. The physician will ask about your history of diseases and if you have a close relative with a hereditary disorder of the immune system to determine if recurrent infections are due to primary immunodeficiency.