Donors of Type O Blood Don't Always Work

Alex was on dialysis and going almost every other day, but he didn't want to miss audrey's birthday. Audrey asked herself whether she would be willing to donate kidney to alex, but she knew his blood type was o positive and hers was a b. Some kidney donations can take place between donors of different blood types, but patients with type o blood typically need donors who are also type o. A donation between them would never work....