Neonatal alloimmune neutropenia

Neonatal alloimmune neutropenia (NAN), also called neonatal alloimmune neutropenia or alloimmune neonatal neutropenia, is a blood condition that affects newborn babies. It happens when a mother's immune system makes antibodies against proteins (called antigens) found on the surface of her baby's white blood cells, specifically a type called neutrophils. These neutrophils are important for fighting bacterial infections. During pregnancy, the mother's antibodies cross the placenta and attack the baby's neutrophils, causing a dangerously low neutrophil count (neutropenia) in the newborn. The condition is similar in concept to hemolytic disease of the newborn, but instead of red blood cells being affected, it is the white blood cells. Babies with NAN are at increased risk of bacterial infections, which can range from mild skin infections to serious life-threatening conditions like sepsis or meningitis. Some babies may have no symptoms at all and are only discovered through routine blood tests, while others may develop fever, skin infections, or umbilical cord infections shortly after birth. The good news is that NAN is usually a self-limiting condition. As the mother's antibodies are gradually cleared from the baby's bloodstream over weeks to months, the neutrophil count typically returns to normal. Treatment depends on severity and may include antibiotics for infections and, in more serious cases, granulocyte colony-stimulating factor (G-CSF) to boost neutrophil production. Intravenous immunoglobulin (IVIG) may also be used. Most babies recover fully within the first few months of life.

Bring these to your next appointment

• Q1.How low is my baby's neutrophil count, and how often will it be checked?,Does my baby need treatment right now, or can we monitor and wait?,What signs of infection should I watch for at home, and when should I go to the emergency room?,How long will it take for my baby's neutrophil count to return to normal?,If I have another baby, what is the chance this will happen again, and can anything be done to prevent it?,Should I avoid breastfeeding, or is it safe for my baby?,Are there any vaccines or routine procedures we should delay while my baby's neutrophil count is low?

Common questions about Neonatal alloimmune neutropenia