Hereditary Persistence of Fetal Hemoglobin aka HPHF is a test to access the elevation or continued existence of fetal hemoglobin in adults. Fetal Hemoglobin (HbF) is a type of hemoglobin present in the human fetus during the last seven months of development in the uterus. It remains present in the body of newborn till 6 months and later is replaced by adult hemoglobin (HbA). In a healthy adult, the normal amount of HbF remains less than one percent. It can be increased when an adult is suffering from these conditions: Pregnancy, Anemia and Leukemia. HPHF determines whether the HbF has elevated or is still present in an adult body.