Primary antibody deficiencies are chronic conditions and the patients usually need lifelong replacement therapy with gammaglobulin to prevent or reduce infections. It has been shown that the gammaglobulin can be given safely as subcutaneous infusions, instead of intramuscular injections or intravenous infusions. The major aim of this multi-centre study was to investigate the perceptions of the subcutaneous method among patients using it, both in hospital settings and as self-infusions at home. The study included 152 patients: 89 women, 63 men, mean age 44 years (range 18-76). Data were collected by using questionnaires. The patients were found to have a strongly positive attitude towards receiving the replacement therapy as subcutaneous infusions, perceived the method as effective in preventing infections and wished to retain the treatment. However, the younger patients found the subcutaneous infusions more uncomfortable and were less determined to continue with the therapy as compared with the older individuals. The responsibility for self-infusions at home was accepted by the patients, leading to an increased independence from the health care personnel and to a feeling of flexibility and freedom. As these patients have a chronic disease and are in need of lifelong treatment, it is important to discuss the development of structured education and training programmes in which special emphasis is placed on the support of the younger patients. It is suggested that Orem's nursing model of self-care may serve as a conceptual framework for nurses working in this specific area of nursing care.