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What Is Cord Blood Transplantation?

Cord blood transplantation is an allogeneic hematopoietic cell transplant that uses blood-forming stem cells collected from the umbilical cord and placenta after a baby is born. Donated cord blood units are tested, typed, cryopreserved, and stored in cord-blood banks until a transplant center selects an appropriate unit. After conditioning treatment, the thawed cells are infused into the recipient through a central venous catheter. The stem cells migrate to the bone marrow and can establish new blood and immune-cell production through engraftment.

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What Is Cord Blood Transplantation?

Cord blood transplantation is an allogeneic hematopoietic cell transplant that uses blood-forming stem cells collected from the umbilical cord and placenta after a baby is born. Donated cord blood units are tested, typed, cryopreserved, and stored in cord-blood banks until a transplant center selects an appropriate unit. After conditioning treatment, the thawed cells are infused into the recipient through a central venous catheter. The stem cells migrate to the bone marrow and can establish new blood and immune-cell production through engraftment.

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Why Is Cord Blood Transplantation Performed?

Cord blood can be used to treat selected leukemias, lymphomas, marrow-failure syndromes, immune deficiencies, and inherited metabolic or blood disorders that require an allogeneic transplant. Cord-blood immune cells are relatively tolerant of human leukocyte antigen differences, allowing greater matching flexibility than many adult-donor grafts. Because units are already collected and frozen, they can also be obtained quickly when a patient needs an urgent transplant. The major tradeoff is the relatively small stem-cell dose in each unit, which can contribute to slower engraftment and can be a particular challenge for larger recipients.

How Is Cord Blood Transplantation Performed?

The transplant team selects a stored cord-blood unit based on human leukocyte antigen compatibility, cell dose, unit quality, and patient-specific factors. The recipient first receives conditioning chemotherapy and sometimes radiation therapy to treat the underlying disease and suppress the immune system. The thawed cord blood is then infused through a central venous catheter in a process similar to a blood transfusion. One or more cord-blood units or specialized expanded-cell products can be used depending on the patient, graft strategy, and transplant center.

What Is Recovery Like After Cord Blood Transplantation?

Patients remain at high risk for infection and bleeding while waiting for the cord-blood cells to engraft and produce adequate white blood cells and platelets. Engraftment is generally slower after cord blood transplantation than after many adult peripheral-blood or marrow grafts because the infused cell dose is smaller. Patients require transfusions, antimicrobial prevention, nutrition and fluid support, and close monitoring during this vulnerable period. Long-term care includes surveillance for graft-versus-host disease, immune recovery, infections, relapse, organ complications, and revaccination needs.

What Are the Risks and Complications?

Possible complications include delayed engraftment, graft failure, severe infection, bleeding, organ toxicity from conditioning, and graft-versus-host disease. Cord blood generally allows more human leukocyte antigen mismatch and has been associated with lower rates or severity of chronic graft-versus-host disease in some studies, but the complication can still occur. Slow immune recovery can prolong susceptibility to serious viral, bacterial, and fungal infections. Relapse of the underlying disease, infertility, secondary cancers, and chronic transplant-related organ problems can also occur.

Frequently Asked Questions About Cord Blood Transplantation

Where does transplant cord blood come from?

It is collected from blood remaining in the umbilical cord and placenta after a baby is born, then tested and cryopreserved in a cord-blood bank.

Does cord blood require a perfect HLA match?

No. Cord-blood grafts can tolerate more human leukocyte antigen mismatch than many adult-donor grafts, although compatibility and cell dose still strongly influence unit selection.

Why can engraftment be slower with cord blood?

Each cord-blood unit contains a relatively limited number of blood-forming stem cells, so recovery of neutrophils, platelets, and immune function can take longer.

Can adults receive cord blood transplantation?

Yes. Adults can receive cord-blood transplants, although cell dose is a major consideration and some patients require strategies that increase the available stem-cell dose.

References

Clinical use of umbilical cord blood hematopoietic stem cells. PubMed. https://pubmed.ncbi.nlm.nih.gov/16399582/. Date Accessed September 11, 2026.

Impact of HLA in cord blood transplantation outcomes. PubMed. https://pubmed.ncbi.nlm.nih.gov/27060588/. Date Accessed September 11, 2026.

Optimizing cord blood selection. PubMed. https://pubmed.ncbi.nlm.nih.gov/31808851/. Date Accessed September 11, 2026.

Pediatric Allogeneic HSCT (PDQ?). National Cancer Institute. https://www.cancer.gov/types/childhood-cancers/hp-stem-cell-transplant/allogeneic. Date Accessed September 11, 2026.

Selection of unrelated donors and cord blood units for hematopoietic cell transplantation: guidelines from the NMDP/CIBMTR. PubMed. https://pubmed.ncbi.nlm.nih.gov/31292117/. Date Accessed September 11, 2026.