Which term refers to an elevated white blood cell count?

Leukocytosis is the term used to describe an elevated white blood cell count, which indicates a response by the immune system to various factors such as infection, inflammation, or stress. White blood cells are crucial components of the immune system, helping the body to fight off infections and other diseases.

When the body detects an issue, it produces more white blood cells to work effectively against pathogens or other threats, leading to the condition known as leukocytosis. This increase in white blood cell count is often measured through a complete blood count (CBC) test, where specific types of leukocytes can also be evaluated for further insights into the underlying causes.

The other terms relate to different blood cell conditions. Thrombocytosis refers to an elevated platelet count, while thrombocytopenia refers to a reduced platelet count. Leukopenia indicates a decreased white blood cell count, which can impair the immune response rather than signify an increase. Thus, leukocytosis is the precise term for an elevated white blood cell count, making it the correct choice in this context.