Is it permissible to donate a kidney to one's ailing mother if the husband refuses?

A Muslim is permitted to donate their kidney to another Muslim in need, provided that it does not cause harm to the donor and that trustworthy doctors determine the operation poses no danger to the donor and is likely to succeed for the recipient. A married woman is not permitted to donate her kidney without her husband's permission, as this can physically affect her and may prevent her from fulfilling her rights.