What does a high white blood cell count usually indicate?

A high white blood cell count, also known as leukocytosis, typically indicates the presence of infection or inflammation in the body. White blood cells are essential components of the immune system, responsible for defending the body against pathogens such as bacteria, viruses, and fungi.

When an infection or inflammation occurs, the body responds by producing more white blood cells to help combat the invading organisms or to respond to injury. As a result, a higher count of these cells is often a clear sign that the body is actively fighting off a condition that could be infectious or a result of tissue damage.

While other conditions can influence white blood cell counts, such as allergies, dehydration, or nutritional deficiencies, they do not typically present with such a straightforward link to increased white blood cell production as seen in infection or inflammation. Thus, the elevation in white blood cells serves as a valuable diagnostic indicator for healthcare professionals in assessing a patient's condition and determining an appropriate course of action.