Dear "Miss",
Hi. If it turns out that you are a suitable donor healthwise, but are not a match for your dad, you may also (if you wish) offer to take part in a "swap" in which you give your kidney to someone else in the same situation, and that person's incompatible donor gives to your dad. Such swaps can be arranged at
www.paireddonation.org or
www.kidneyregistry.org Another option (again, if you are healthy enough to donate but are not a match for your dad) is a "list exchange" in which you give your kidney to whoever the hospital picks as the best match from the waiting list, and in return you dad is moved up to the top (or close to the top) of the waiting list for the next available matching kidney from a deceased donor. This is usually quicker than a "swap", since finding two pairs is not required.
SOME hospitals will not suggest these options unless you ask about them, for fear of pressuring you, so you might have to take the initiate to ask about them and say you are willing.
Even if it turns out that you cannot donate to your dad, you might want to consider telling him anyway. It can mean a LOT to a person just knowing that someone cared enough to even offer and be tested.
best wishes,
Fr. Pat