The Primary Immunodeficiency Disease (PIDD) Toolkit was developed by the BC Provincial Blood Coordinating Office (PBCO) in collaboration with a group of provincial immunologists and transfusion medicine physicians. The Toolkit is intended to support the diagnosis, treatment and monitoring of patients with PIDD. The App contains diagnostic and treatment algorithms (presented in two different formats), a dose calculator to determine IVIG or SCIG dose, a dose adjustment calculator, links to the BC provincial IG recommendations as well as other links and references of interest.