Blood that remains in the placenta and in the attached umbilical cord after childbirth. Cord blood is collected because it contains stem cells which can be used to treat hematopoietic and genetic disorders.

Blood taken from the umbilical cord at the time of birth. It is rich in a variety of stem cells. For further information see http://www.alsa.org/research/article.cfm?id=1147.

The blood in a pregnant woman’s umbilical cord and placenta. Cord blood is rich in stem cells, which can be used for lifesaving transplants. Anthony Nolan’s cord blood programme

Blood remaining in the umbilical cord immediately following the birth of a baby. It contains a rich concentration of stem cells which can save the life of a leukemia or other patient requiring a stem [..]

The whole blood including hematopoietic progenitor cells, collected from placental and umbilical cord blood vessels after the umbilical cord has been clamped.

A blood sample from the fetus (to study chromosomes, for example) can be obtained by inserting a fine needle into the umbilical cord, under ultrasound guidance.