Leukemoid reaction is best described as:

Leukemoid reaction is best described as:

• A. A clinical syndrome resembling leukemia but not leukemia
• B. A type of leukemia
• C. A myeloproliferative neoplasm
• D. A benign infection marker

Answer: (A)

Leukemoid reaction is a reactive, nonmalignant increase in white blood cells that mimics leukemia but is not leukemia itself. It occurs in response to severe infection, inflammation, or stress and shows a high neutrophil count with a left shift and maturation toward normal neutrophils. The white cell count can be very high, but unlike leukemia, especially chronic myeloid leukemia, it is a reactive process. Helpful clues include a high leukocyte alkaline phosphatase (LAP) score and the absence of malignant blasts or the BCR-ABL1 fusion (Philadelphia chromosome). So the best description is a clinical syndrome resembling leukemia but not leukemia. It’s not a type of leukemia, nor a myeloproliferative neoplasm, and while it relates to infection, calling it a benign infection marker isn’t accurate because it represents a real reactive process causing leukocytosis.

Leukemoid reaction is a reactive, nonmalignant increase in white blood cells that mimics leukemia but is not leukemia itself. It occurs in response to severe infection, inflammation, or stress and shows a high neutrophil count with a left shift and maturation toward normal neutrophils. The white cell count can be very high, but unlike leukemia, especially chronic myeloid leukemia, it is a reactive process. Helpful clues include a high leukocyte alkaline phosphatase (LAP) score and the absence of malignant blasts or the BCR-ABL1 fusion (Philadelphia chromosome).

So the best description is a clinical syndrome resembling leukemia but not leukemia. It’s not a type of leukemia, nor a myeloproliferative neoplasm, and while it relates to infection, calling it a benign infection marker isn’t accurate because it represents a real reactive process causing leukocytosis.