Could you tell me what are some leads to of low white blood count other than leukemia?

Many: Primary or secondary blood disorder, infection, immunologic diseases, medication, and many other possibilities. Most causes would be treatable. If this has been confirmed then consultation with a hematologist would be appropriate.

Multiple: If you mean other causes of low WBC besides leukemia, multiple clinical situations can be associated with leukopenia (low wbc): infections (especially in children and the elderly), congenital neutropenia (for example kostmann syndrome), aplastic processes (bone marrow failure), peripheral destruction (antineutrophil antibodies) or sequestration (hypersplenism), chemotherapy, radiation, etc.