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The immune system is one of the basic mechanisms of the organism that maintains balance. Immunodeficiency conditions are disorders of any component of immune defence, resulting from the absence or insufficiency of function of one or more components of the immune system. At present, subcutaneous administration of immunoglobulins is preferred because it improves the quality of life of the patient due to being applied in the home. The limitations on the patient are fewer than in comparison with intravenous administration. Subcutaneous administration of drug preparations is a less frequent, but very important, parenteral route for administration of medicinal substances to the subcutaneous tissue. [ABSTRACT FROM AUTHOR]