You can back out at anytime....even before they wheel you in for surgery. They will always give you a “medical” out of you simply say I can’t do it.
You’re expenses for testing are covered. Your medical expenses for transplant are covered.
If you have issues down the line after donation, you as slot #1 top of the list to receive transplant.
They test so much & science is so advanced that the risk of issues is very small. We, as a family who’s father needs a kidney, will hold his future donor in highest esteem.