What is umbilical cord blood? Umbilical cord blood refers to the blood that remains in the umbilical cord when a baby is born. It contains hematopoietic stem cells that can differentiate into various cell types and has important medical value. Cord blood is collected within the first few minutes of a baby\’s life and can be stored for up to decades under the right circumstances. The main role of umbilical cord blood is in various stem cell transplants, which can treat many diseases caused by blood or immune system disorders. For example, a variety of diseases, including leukemia, lymphoma, and bone marrow disorders, can be treated with stem cell transplants. In addition, umbilical cord blood can also be used in various research fields