Kleihauer–Betke test
（重定向自Kleihauer Betke test）
![Kleihauer test, showing fetal red blood cells in rose-pink color, while adult red blood cells are only seen as](/Images/godic/202501/22/Kleihauer3732.JPG")
The Kleihauer–Betke ("KB") test, Kleihauer–Betke ("KB") stain , Kleihauer test or Acid elution test ,is a blood test used to measure the amount of fetal hemoglobin transferred from a fetus to a mother's bloodstream. It is usually performed on Rh-negative mothers to determine the required dose of Rho(D) immune globulin (RhIg) to inhibit formation of Rh antibodies in the mother and prevent Rh disease in future Rh-positive children.