What is the normal white blood cell (WBC) count range in cells per microliter?

• A. 3000-5000
• B. 5000-10,000
• C. 10,000-15,000
• D. 15,000-20,000

Answer: (B)

The normal white blood cell (WBC) count for a healthy adult typically ranges from 5,000 to 10,000 cells per microliter of blood. This range reflects the body's ability to produce adequate amounts of white blood cells, which are crucial for the immune response and protecting against infections. Values below 5,000 can indicate leukopenia, which may stem from various conditions such as bone marrow disorders or autoimmune diseases. Conversely, counts above 10,000 may indicate leukocytosis, often associated with infections, inflammation, or stress responses. Understanding the normal range helps healthcare professionals diagnose and manage a wide variety of medical conditions effectively.