Neonatal neutropenia

Neonatal neutropenia is a hematological condition characterized by an abnormally low number of neutrophils (a type of white blood cell essential for fighting bacterial and fungal infections) in newborn infants. Neutropenia in neonates is generally defined as an absolute neutrophil count (ANC) below 1,000–1,500 cells per microliter of blood, though reference ranges vary depending on gestational age and postnatal age. The condition primarily affects the immune system, leaving affected neonates vulnerable to serious and potentially life-threatening bacterial and fungal infections. Clinical manifestations may include fever, skin infections, omphalitis (infection of the umbilical stump), pneumonia, sepsis, and other localized or systemic infections. Neonatal neutropenia can arise from multiple etiologies. It may be alloimmune (caused by maternal antibodies directed against fetal neutrophil antigens, analogous to hemolytic disease of the newborn), autoimmune (associated with maternal autoimmune conditions), or secondary to maternal conditions such as pregnancy-induced hypertension or preeclampsia. It can also occur in the context of congenital or genetic forms of neutropenia, infections (bacterial or viral), necrotizing enterocolitis, or bone marrow suppression. Premature and low-birth-weight infants are particularly susceptible. Management depends on the underlying cause and severity. In many cases, neonatal neutropenia is transient and resolves spontaneously within days to weeks as the infant's bone marrow matures or as maternal antibodies are cleared. For infants with severe neutropenia and active or recurrent infections, treatment may include antibiotics, antifungal agents, and in some cases recombinant granulocyte colony-stimulating factor (G-CSF) to stimulate neutrophil production. Intravenous immunoglobulin (IVIG) may be considered in alloimmune cases. Close monitoring of blood counts and vigilant infection surveillance are essential components of care.

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