Who cannot donate a kidney?

Children: Usually children are excluded from donating kidneys. There are a host of diseases that can prevent a person from donating a kidney. Hiv is probably the foremost. Some types of cancer are also included.

Certain restrictions: If you mean living donors. Those with abnormal kidneys, or conditions that would put them at future risk for kidney disease. Those with other problems that make elective surgery unsafe, or can transmit a disease to the recipient. Those who can not demonstrate that their decision to donate is made with informed consent and free of undue coercion from others. Those that are being paid to donate.