Peripheral blood stem cell (PBSC) donation is a medical procedure used to collect stem cells from a donor's blood. These stem cells can help treat various diseases, including certain types of cancer and blood disorders. The process typically involves a donor receiving medication for several days to increase stem cell production before the cells are collected through a blood donation. During the collection, blood is drawn from one arm, processed to separate the stem cells, and then returned through the other arm. This method is less invasive than traditional bone marrow donation and allows for a quicker recovery for the donor.