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Leukemoid reaction

Last edited: 4/23/2026

Overview

A leukemoid reaction is a reactive process characterized by peripheral blood findings resembling leukemia, including marked leukocytosis with left-shift, often triggered by severe inflammatory or infectious conditions 1.

Diagnosis

  • Clinical Context: Presence of severe infection, inflammation, malignancy, or other triggers 1.
  • Laboratory Findings:
    • - Leukocytosis (often >100,000/μL) - Left shift (presence of immature cells like myelocytes, promyelocytes) - Reactive thrombocytosis
  • Differential Diagnosis: Distinguish from true hematologic malignancies through bone marrow examination if clinically indicated 1.

    • Management

  • Underlying Cause: Address and treat the primary condition (e.g., infection, inflammation) 1.
  • Supportive Care:
    • - Fluid management - Symptomatic treatment (e.g., fever control)
  • Pharmacological Interventions: No specific drug classes or doses mentioned for leukemoid reaction management 1.

    • Special Populations

  • Donor Safety in Leukapheresis: Selective donor recruitment and adherence to operational protocols are critical to minimize risks 1.
  • Additional Data Needed: Long-term effects of repeated leukapheresis on donors require further study 1.

    • Key Recommendations

  • Selectively Recruit Donors for Leukapheresis to minimize health risks (Evidence: Expert opinion) 1
  • Adhere Strictly to Operational Protocols during leukapheresis procedures to ensure donor safety (Evidence: Expert opinion) 1
  • Continuously Monitor Donors for any adverse reactions post-procedure, with particular attention to long-term outcomes (Evidence: Expert opinion) 1

    • References

    1 Sandler SG, Nusbacher J. Health risk of leukapheresis donors. Haematologia 1982. link

    Original source

    1. [1]
      Health risk of leukapheresis donors. — Sandler SG, Nusbacher J Haematologia (1982)
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