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A leukemoid reaction is a reactive increase in the white blood cell count, which can mimic leukemia.The reaction is actually due to an infection or another disease and is not a sign of cancer.
Blood counts usually return to normal when the underlying condition is treated.
Nola M, Dotlic S. The hematopoietic and lymphoid systems. In: Damjanov I, ed. Pathology Secrets. 3rd ed. Philadelphia, PA: Elsevier Mosby; 2009:chap 9.
Reviewed By: Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.