The<unk><unk>  ("KB") test,<unk><unk>  ("KB") stain,<unk>  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. It is named after Enno<unk>  and Klaus<unk>  who described it in 1957.
Kleihauer–Betke test
Kurzrock–Miller test
Poppy seed test
Galeazzi test
Conconi test
Beutler test
Czermak–Hering test
Yeoman's test