This test uses multiparameter flow cytometric immunophenotyping to identify and characterize abnormal hematopoietic cell populations in peripheral blood, bone marrow, or tissue samples. It assists in the diagnosis, classification, and differentiation of myeloid neoplasms, hairy cell leukemia, and non-Hodgkin lymphomas (NHL) by analyzing the expression of lineage-specific and disease-associated cell surface and cytoplasmic markers.