Management of Active Leukocytosis

Diagnostic Approach

• Blood cultures and other appropriate cultures should be obtained before starting antibiotics if infection is suspected, particularly in patients with febrile neutropenia 1

Management Based on Severity

Severe Leukocytosis (Hyperleukocytosis >100,000/μL)

• Aggressive intravenous hydration (2.5-3 liters/m²/day) titrated according to fluid balance and clinical status should be implemented immediately 2
• Monitor for and prevent tumor lysis syndrome with allopurinol or rasburicase in high-risk patients 1
• Consider hydroxyurea (50-60 mg/kg/day) to rapidly reduce white blood cell counts in cases of hyperleukocytosis 1, 2

Management of Complications

• In emergency organ-threatening conditions (cerebral or pulmonary leukostasis), consider leukapheresis or exchange transfusion 2
• Note: Leukapheresis should be avoided in Acute Promyelocytic Leukemia (APL) patients due to risk of fatal hemorrhage 1
• Maintain platelet counts above 30-50 × 10^9/L and fibrinogen above 100-150 mg/dL 1
• Monitor electrolytes closely and correct abnormalities in patients with Tumor Lysis Syndrome (TLS) 3

Special Considerations

• Avoid invasive procedures such as central venous catheterization in patients with severe neutropenia due to risk of hemorrhagic complications 1
• Antimicrobial prophylaxis may be considered in prolonged neutropenia based on institutional protocols 1
• Avoid azole antifungals during anthracycline chemotherapy due to drug interactions that can increase toxicity 1, 3