Each year three thousand people in the U-S will die while waiting for a bone marrow transplant.
It's often hard to find a good match, because only 2% of Americans are registered donors.
Carla Burbidge tells us how you can help in this week's Eye on Health.
Greg Stack has worked at United Blood Services 26 years, so he knows a thing or two about giving for others.
Back in the 80's he registered to be a bone marrow donor.
He didn't hear from the National Bone Marrow Registry until 2009.
At no expense to him, they flew him to the University of Minnesota to become the donor to a young boy with a blood disease.
(Greg Stack, Bone Marrow Donor) "I was the best match, they said we could have been brothers."
18 year old Peter Wilson of Minot, is going through chemo for leukemia this spring, and luckily a match has been found for him too.
Peter, a high school senior, has been in Mayo in Rochester for weeks.
In fact, his girlfriend Haley Wentz, also a senior, didn't want Peter to miss out on the prom.
She took the prom to his hospital room.
Peter is set to have his bone marrow transplant in May.
(Haley Wentz, Senior) "Doctors say he has a very good chance of attending college in the fall."
Peter has a match, but that hasn't stopped Haley from helping.
She has organized a bone marrow drive for April 27, in honor of Peter.
To get registered these days, you simply supply contact information, and get your check swabbed.
(Haley Wentz, Senior) "Very easy, no needles involved."
Greg can confirm, it is easy.
And should you be a match for someone, that's not hard either.
During surgery, doctors took bone marrow from Greg's hips, he recovered in a couple of days, and the body does re grow the bone marrow.
And while Greg can have no contact with the boy until the boy is 18, he has been told the boy has recovered well.
(Greg Stack, Bone Marrow Donor) "It's a pretty easy thing to do to save a life."
Remember, Saturday April 27th 10-4 at Magic City Campus...a bone marrow drive in honor of Peter.
It's simple and only takes a few minutes.
For Eye on Health I'm Carla Burbidge.