The reagent used in Apt test is

Alkali denaturation test (Apt-Downey test / apt test)Used to detect differentiate Fetal or neonatal blood from maternal blood (Qualitative).PrincipleMethodFetal hemoglobin (alpha 2 gamma 2 subunits) is resistant to alkali (basic) denaturation, whereas adult hemoglobin (alpha2 beta 2 subunits) is susceptible to such denaturation.Exposing the blood specimen to sodium hydroxide (NaOH) will denature the adult but NOT the fetal hemoglobin.The fetal hemoglobin will appear as a pinkish color under the microscope while the adult hemoglobin will appear as a yellow-brownish colorThe blood is mixed with sterile water to cause hemolysis of the RBCs, yielding free hemoglobin,The 5 ml pink hemoglobin-containing supernatant is then mixed with 1 mL of 1% NaOH.Fetal hemoglobin will stay pink and adult hemoglobin will turn yellow-brown.Adult hemoglobin changes color because it is less stable and will conve to hematin.Clinical UsesVaginal bleeding in late pregnancy is tested to rule vasa pre.Neonatal bloody vomitus or bloody stool to rule out swallowed maternal blood.To detect the presence of fetal blood in the maternal circulation in cases of suspected fetal-maternal hemorrhage.Positive test indicates that blood is of fetal origin.Negative test indicates that the blood is of maternal origin.