What is Cord Blood?

After a baby is born and the umbilical cord is cut, some blood remains in the blood vessels of the placenta and the portion of the umbilical cord that remains attached to it. After birth, the baby no longer needs this extra blood. This blood is called placental blood or umbilical cord blood: "cord blood" for short.

Cord blood contains all the normal elements of blood - red blood cells, white blood cells, platelets and plasma. But it is also rich in hematopoietic (blood-forming) stem cells, similar to those found in bone marrow. This is why cord blood can be used for transplantation as an alternative to bone marrow.

Cord blood is being used increasingly on an experimental basis as a source of stem cells, as an alternative to bone marrow. Most cord blood transplants have been performed in patients with blood and immune system diseases. Cord Blood transplants have also been performed for patients with genetic or metabolic diseases.  More than 80 different diseases have been treated to date with unrelated cord blood transplants.

What is the umbilical cord?

The umbilical cord connects a baby in the womb to its mother. It runs from an opening in your baby’s stomach to the placenta in the womb. The average cord is about 50cm (20 inches) long.

What does the umbilical cord do?

In the placenta, oxygen and nutrients from your bloodstream pass into your baby's bloodstream and are carried to your baby along the umbilical cord.

Blood circulates through vessels in the cord, which consists of:

• one vein that carries blood rich in oxygen and nutrients from you to your baby
• two arteries that return deoxygenated blood and waste products, such as carbon dioxide, from your baby back to the placenta

These blood vessels are enclosed and protected by a sticky substance called Wharton’s jelly, which itself is covered by a layer of membrane called the amnion.

Towards the end of your pregnancy, the placenta passes antibodies through the umbilical cord from you to your baby, giving it immunity from infections for about three months after birth. However, it only passes on antibodies that you already have.