<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, may I answer your health queries right now ? Please type your query here...my father has to undergo liver transplant .he is 52 years old and his blood group is AB.which blood group doner can give him his liver .can a person of age 27 give him what r the risks involved for both the doner and the reciptent.  <response>: Hi, Recipients with blood type AB can receive a kidney from blood types A, B, AB and O AB is the universal recipient. Also, he can receive it from 27 years old. Risk are higher for recipient but in most cases surgery goes well and there are no serious complications. I hope I have answered you query. If you have any further questions you can contact us in every time. Wish you a good health. Kindly regards, Ivan R. Rammstein 