The British Society of Blood and Marrow Transplantation and Cellular Therapy (BSBMTCT) Registry collects and co-ordinates information on all haematopoietic stem cell transplantation (HSCT) activity in the UK and the Republic of Ireland. National and international registries underwent rapid policy adaptations to prepare for potential harvest cancellations due to donor availability, donor or patient illness and operational restrictions. Peripheral blood stem cell yield in 400 normal donors mobilised with granulocyte colony-stimulating factor (G-CSF): impact of age, sex, donor weight and type of G-CSF used. [Extracted from the article]