These include: the use of marginal donors, an ill-defined group comprised of donors over the age of 60; donors with greater than 30% hypernatremia or macrosteatosis; donors with positive serologies for the hepatitis C or hepatitis B virus; donors with a cold ischemia time of greater than 12 hours; non-heart-beating donors; and grafts from split-livers or living-related donors.
Source: wiktionary