Leukopenia, or a low serum white blood cell (WBC) count, can be due to diseases of the bone marrow, medications, and from infection. Infection more commonly elevates the WBC count but it should be noted that infection can cause a low number as well.
Leukopenia medical expert witness specialties include hematology, oncology, pediatric hematology, pediatric oncology, critical care medicine, internal medicine, pediatrics, pediatric critical care medicine, infectious disease, pediatric infectious disease, urgent care medicine, and laboratory medicine.