Abstract
IN the five years that have elapsed since the Rh factor in human red cells — better known as the Rh blood type — was first discovered, there has been a steadily increasing volume of literature on this subject. In the past two years alone, more than two hundred such articles have appeared in medical journals. Many of these have been concerned with the laboratory aspects of Rh typing, Rh antiserums, nomenclature and the heredity of the possible subtypes of the Rh factor, thus suggesting to some physicians that this new field has in it relatively little of clinical value. . . .