Conclusion. "New Blood" examines challenges 21st-century blood banks face in keeping up supplies. There are never enough donors, but in the West, at least, supplies are finally safe (though mad-cow disease could be a threat). The reason: sophisticated tests that Third World blood centers can't afford. Differences (and similarities) in dealing with blood are seen as two women---one in New York, the other in Delhi---await open-heart surgery. The series is based on commentator Douglas Starr's Book "Red Gold: An Epic History of Medicine and Commerce."