Constitutional Topic: The Preamble. The Constitutional Topics pages at the USConstitution.net site are presented to delve deeper into topics than can be provided on the Glossary Page or in the FAQ pages. This Topic Page concerns The Preamble. The first paragraph of the Constitution provides the context for the Constitution â the why of the document. The Constitution was written by several committees over the summer of 1787, but the committee most responsible for the final form we know today is the Committee of Stile and Arrangement.
1 Antibody screen is another blood test that can show if an Rh-negative woman has developed antibodies to Rh-positive blood. 2  An injection of Rh immunoglobulin (RhIg), a blood product that can prevent sensitization of an Rh-negative mother.
For the band, see The RH Factor. The Rh blood group system (including the Rh factor) is one of thirty-five current human blood group systems. It is the second most important blood group system, after ABO, and it consists of 50 defined blood-group antigens, among which the five antigens D, C, c, E, and e are the most important. The commonly used terms Rh factor, Rh positive and Rh negative refer to the D antigen only.