Construction of a Health-related Quality of Life (HR-QOL) Questionnaire for Patients With Primary Antibody Deficiency Disease

The HR-QOL PIDD survey will be administered to the patient by the site PI or the study coordinator. A second survey will be handed to the patient to take home with them and completed at 48-120 hrs. after the clinic visit. The study coordinator will contact the patient during this period to ensure that the patient completes this second survey and returns it to the local study site. A case report form (CRF) of their clinical condition and demographics will be collected at the time of informed consent.