Flow Cytometric, Morphologic, and Laboratory Comparative Study in Patients with Leukocytosis and Cytopenia

Abstract

Objectives: We wanted to evaluate the effectiveness of flow cytometry immunophenotyping (FCI) as a screening test for patients with leukocytosis and cytopenia. Methods: We identified 320 patients during August 2016 to December 2016 and evaluated FCI and morphology of peripheral blood smears (PBSs). Results: The most common indications for FCI included history of hematologic malignancy (HHM, n = 126), leukocytosis (n = 80), and cytopenia (n = 53). Positive FCI rate was low with a range of 4.4% to 12.5% in patients with absolute neutrophilia regardless of HHM, if cases with circulating blasts were excluded. Patients with absolute lymphocytosis had a 93% positive FCI rate. Patients with HHM and pancytopenia showed a higher incidence of positive FCI findings than patients without HHM and with isolated cytopenia. PBS morphology correlated strongly with FCI (P =. 0001). Conclusion: PBS evaluation is an accurate and cost-effective screening test. FCI for patients with mature neutrophilia and isolated cytopenia has a very low yield.