Cord blood donation is the process of collecting blood from a newborn’s umbilical cord immediately after birth and sending it to a public bank, where it becomes available to any patient who needs a stem cell transplant. The blood left in the umbilical cord and placenta after delivery is rich in a type of stem cell that can rebuild a person’s blood and immune system, making it a lifesaving resource for people with leukemia, lymphoma, and other serious blood disorders.
Why Cord Blood Is Medically Valuable
The stem cells in cord blood are hematopoietic stem cells, the same type found in bone marrow. They can self-renew indefinitely and differentiate into the specialized blood and immune cells the body needs. When someone’s bone marrow is diseased or destroyed by chemotherapy, a transplant of these stem cells can essentially restart their blood-forming system from scratch.
Cord blood has several practical advantages over bone marrow as a transplant source. It’s easier and cheaper to process, carries a lower risk of transmitting infections, and doesn’t require as precise a tissue match between donor and recipient. That last point is especially important: bone marrow transplants typically need a close match of specific proteins on the surface of cells (called HLA markers), but cord blood transplants are more forgiving of mismatches, which means more patients can find a usable donor unit.
Conditions Treated With Cord Blood
The FDA recognizes cord blood as a treatment for cancers of the blood and lymphatic system, including leukemia and lymphoma. It’s also used for certain inherited metabolic disorders and immune system deficiencies. These are established, routine uses, not experimental therapies. For patients who can’t find a matched bone marrow donor, a cord blood unit from a public bank may be their best or only option.
How Collection Works
Collection happens in the minutes after delivery, and it doesn’t change anything about your birth experience. After the baby is born and the umbilical cord is clamped and cut, a provider either inserts a needle into the cord to draw out the remaining blood or lets it drain into a collection bag. The whole process takes just a few minutes. It poses no risk to the mother or the baby, since the blood being collected would otherwise be discarded with the placenta.
Once collected, the blood is shipped to a cord blood bank and typically tested, processed, and cryogenically stored within 36 to 48 hours. Units are kept in the vapor phase of liquid nitrogen at temperatures below negative 170 degrees Celsius, where they can remain viable for years. Not every collection yields enough blood to be useful. Public banks will only store a unit if it’s sterile and contains enough stem cells to actually work in a transplant.
Delayed Cord Clamping and Donation
One common question is whether cord blood donation conflicts with delayed cord clamping, a practice now recommended by the American College of Obstetricians and Gynecologists. Waiting at least 30 to 60 seconds before clamping allows 80 to 100 milliliters of blood to transfer from the placenta to the newborn, boosting the baby’s hemoglobin and iron stores in the first months of life. For preterm infants, the benefits are even more pronounced, including lower rates of certain serious complications.
Delayed clamping does reduce the total volume of blood left in the cord for collection, which can mean fewer stem cells in the donated unit. However, international cord blood banks report that when a skilled provider performs the collection after a standard delay, the resulting unit can still be adequate. In practice, your delivery team will prioritize the baby’s care first. ACOG guidelines are clear that cord blood collection should never delay emergency care of the mother or newborn.
Public Donation vs. Private Banking
There are two very different things you can do with cord blood, and the distinction matters. Public donation means giving the cord blood to a public bank at no cost to you. The unit is listed on the Be The Match registry and made available to any patient worldwide who needs a transplant. Public banks follow strict FDA quality and sterility regulations and will only store units that meet minimum cell count thresholds.
Private banking, by contrast, means paying a company to store your baby’s cord blood exclusively for your family’s future use. You’ll pay an upfront collection fee plus ongoing annual storage fees. Because the blood is reserved for personal use, private banks are not held to the same quality standards as public banks, and they will store any amount of cord blood, even if it doesn’t contain enough stem cells to be useful in a transplant. The odds of your own child needing their stored cord blood are extremely low, which is why most medical organizations encourage public donation when possible.
Who Can Donate
Eligibility requirements for public cord blood donation focus on the health history of the birth parent. You need to be at least 18 years old and expecting a single baby with no known fetal abnormalities. You and the baby’s father cannot be blood relatives (such as first cousins). You’ll also be screened for communicable diseases before collection.
Several factors will disqualify you. These include:
- Exposure to or infection with hepatitis B or C, HIV, West Nile virus, or tuberculosis
- Any history of cancer or leukemia in you, the baby’s father, or any of the baby’s siblings
- Prior chemotherapy treatment
- Tattoos or piercings in the last 12 months where shared or non-sterile equipment was used
- Use of certain immune-suppressing medications
- A positive syphilis test or blood transfusion in the last 12 months
The screening criteria exist to protect transplant recipients, whose immune systems are already compromised by the time they receive a cord blood unit.
Why Diverse Donors Are Needed
Tissue matching still matters in cord blood transplants, even though the requirements are less strict than for bone marrow. Patients are more likely to find a well-matched unit from a donor of similar racial or ethnic background, and public cord blood banks currently have significant gaps. In one analysis of transplants using two cord blood units, only 19% of Black patients received both units from Black donors, compared to 51% of white patients receiving both units from white donors. Asian patients received both units from Asian donors just 21% of the time.
These disparities exist because fewer donations come from communities of color. Some U.S. cord blood banks receive financial incentives from federal agencies to collect units from a more diverse population, but the gap remains wide. If you’re from an underrepresented background and meet the eligibility criteria, your donation has an outsized impact on expanding treatment options for patients who currently have the fewest matches available to them.