What condition is marked by an increased number of white blood cells?

Leukocytosis is characterized by an elevated number of white blood cells (WBCs) in the bloodstream. This condition often arises in response to infection, inflammation, stress, or certain diseases, indicating that the body is in a state of heightened immune activity. The increase in white blood cells serves a crucial role in the immune response, helping to fight off pathogens such as bacteria and viruses.

In contrast, leukopenia refers to a reduced number of white blood cells, which can compromise the body’s ability to fight infections. Anemia is related to a deficiency of red blood cells or hemoglobin, leading to reduced oxygen transport in the blood. Thrombocytopenia involves a low platelet count, which can affect clotting ability but does not pertain to white blood cell counts. Recognizing these distinctions is essential in understanding hematological conditions and their implications in clinical practice.