Jon the Be The Match Registry and get a free bone marrow test kit. It’s as easy as swabbing the inside of your cheek and then returning the kit. If you’re an eligible match for a needy recipient, you could be part of saving a life!
More information is available on this page, and I suggest that you read through it all if you are considering being a bone marrow donor. Many very sick people benefit from bone marrow donation every day.