However, his doctor told us that as long as Kelptyn's test shows us 20% donor or higher (ideally we just want to see it stabilize over time) than that is enough to give him functioning osteoclasts and rid him of the Osteopetrosis. We were told that Kelptyn may never be 100% donor again and that's okay as long as he engrafts enough of the donor cells to keep his osteoclasts working for him. So essentially his donor's marrow and his own may coexist in perfect harmony if all goes well.
We are waiting on another test, that was just sent to the lab today, to show us the percentages again. We'll be checking them every week for awhile now. If today's test shows another rapid donor cell loss then Kelptyn may have a second transplant of donor cells as early as next week. If his test results show stabilization of counts then we celebrate and cheer them on.