Pittsylvania County Service Authority PO BOX 209 Blairs, VA 24527-0209: Phone: 434-836-7135 Fax: 434-836-7139 Emergency Contact: 434-432-7931. Email Address: pcsa405@comcast.net Physical Address 405 R & L Smith Drive Danville, VA 24540 Click here for directions
Hemolytic disease of the newborn, also known as hemolytic disease of the fetus and newborn, HDN, HDFN, or erythroblastosis fetalis, is an alloimmune condition that develops in a fetus, when the IgG molecules (one of the five main types of antibodies) produced by the mother pass through the placenta.
Erythroblastosis fetalis is also known as hemolytic disease of the newborn (HDN). It occurs when the blood of the baby combines with the motherâs blood during pregnancy, and the immune system of the mother produces a certain reaction, wherein the white blood cells attack the red blood cells of the baby as they recognize it as foreign invaders.