What is the normal range for white blood cell (WBC) counts?

The normal range for white blood cell (WBC) counts is important in assessing an individual's immune function and overall health. The commonly accepted reference range for WBC counts in adults is typically around 4.0 to 11.0 x 10^9 cells per liter of blood. This reflects the body's ability to respond to infections and other immune challenges.

The selected answer falls within a slightly broader variation that is sometimes considered acceptable in clinical practice, which can account for laboratory differences and demographic factors. While normal values can vary slightly depending on the laboratory and population studied, option B, at 3.8-10.4, reflects an acceptable range that aligns with clinical practice in certain settings, especially when considering different populations.

In clinical contexts, it is essential to understand that WBC counts can fluctuate based on various factors, including stress, infection, and other medical conditions. Ranges can also be influenced by the methodologies employed by various laboratories. Understanding these nuances is critical for interpreting lab results effectively in patient care.