A left shift is characterized by an increase in which cells?

A left shift is characterized by an increase in which cells?

• A. Increase in lymphocytes
• B. Increase in immature neutrophils
• C. Increase in platelets
• D. Increase in eosinophils

Answer: (B)

Left shift describes an increase in immature neutrophils in the peripheral blood, typically band neutrophils, indicating the bone marrow is releasing cells before full maturation to meet a high inflammatory or infectious demand. This reflects a rapid, reactive bone marrow response to infection or inflammation. Other cell types mentioned don’t define a left shift: lymphocytes rise for different immune scenarios (often viral or chronic conditions), platelets can increase with inflammation but not due to neutrophil maturation, and eosinophils rise in allergic or parasitic contexts.

Left shift describes an increase in immature neutrophils in the peripheral blood, typically band neutrophils, indicating the bone marrow is releasing cells before full maturation to meet a high inflammatory or infectious demand. This reflects a rapid, reactive bone marrow response to infection or inflammation. Other cell types mentioned don’t define a left shift: lymphocytes rise for different immune scenarios (often viral or chronic conditions), platelets can increase with inflammation but not due to neutrophil maturation, and eosinophils rise in allergic or parasitic contexts.