How stem cell donation works

Stem cell donation is usually a medical process where a healthy donor gives blood-forming stem cells so a patient can rebuild their blood and immune system. The two main donation methods are peripheral blood stem cell donation, which is most common, and bone marrow donation.

Quick Scoop

In the most common method, donors take injections of a growth factor called G-CSF for a few days before donation to move more stem cells from the bone marrow into the bloodstream. On donation day, blood is collected from one arm, passed through a machine that removes the stem cells, and the rest of the blood is returned through the other arm; this is called apheresis and usually takes about 4 to 6 hours.

Step-by-step

  1. You register and give a blood sample so your tissue type can be tested and matched with a patient.
  1. If you are a match, the team checks your health again and explains the procedure and risks.
  1. For PBSC donation, you receive G-CSF injections for about four days before collection.
  1. On donation day, the apheresis machine separates stem cells from your blood and returns the rest to you.
  1. In some cases, a second donation day is needed if enough cells were not collected the first time.

Bone marrow option

Bone marrow donation is different from PBSC donation. It is usually done under general anesthesia, and a doctor removes liquid marrow from the back of the pelvic bones with a needle. The procedure typically lasts 45 to 90 minutes.

What it feels like

PBSC donation is not surgery, but the injections can cause temporary side effects such as bone or muscle aches, because the medication stimulates your marrow. Bone marrow donation involves anesthesia and a recovery period afterward, so it is more like a minor surgical procedure.

Why it matters

The donated stem cells are given to a patient who often has blood cancer or another condition that damaged the bone marrow. After the patient’s preparatory treatment, the donated cells travel to the bone marrow and start making new blood cells, usually within 2 to 3 weeks.
Method How it works Typical time
PBSC donation G-CSF injections, then stem cells are collected from blood by a machine About 4 to 6 hours
Bone marrow donation Liquid marrow is taken from the pelvic bone under anesthesia About 45 to 90 minutes
The short version is: match first, prepare with testing, collect the cells, then the patient receives them by infusion and the cells help restart blood production.

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