###Human: Male donor is kell positive. What are the associated risks to the surrogate? ###Assistant: Hello. Few points include: 1. As per medical facts, the first pregnancy remains silent. In your case surrogate is kell negative it means her body is still not exposed to kell antigens which are good, so this pregnancy will be safe. 2. As the husband is heterozygous, it means he has only a 50 % chance of having baby kell positive. In the rest 50 %, there is no risk of complications. So, theoretically, this pregnancy should go silent without complications. But then surrogate will be exposed to kell antigen from your husband, she should be aware of this risk which can create trouble in future pregnancies if the male is kell positive.