👉 The Ru fluid, also known as Rhesus factor or Duffy antigen, is a protein found on the surface of red blood cells (RBCs) that plays a crucial role in blood compatibility and transfusion medicine. It is named after the scientist who first identified it, Dr. Paul Ru. The presence or absence of the Duffy antigen on RBCs determines whether an individual is Rh-positive (Rh+) or Rh-negative (Rh-). Rh+ individuals can receive Rh+ blood, while Rh- individuals can only receive Rh- blood. This antigen is significant because it can cause complications in transfusions and pregnancies between an Rh+ mother and an Rh- fetus, leading to hemolytic disease of the newborn (HDN) if not properly managed. Thus, understanding Ru fluid is essential for safe blood transfusions and prenatal care.
