What is the normal white blood cell count range in adults?

What is the normal white blood cell count range in adults?

• A. 2,000-4,000
• B. 6,000-8,000
• C. 4,000-6,000
• D. 8,000-10,000

Answer: (C)

White blood cell count reflects the number of immune cells circulating in the blood. In healthy adults, the typical reference range is about 4,000 to 11,000 cells per microliter, though exact cutoffs can vary a bit by laboratory. Counts well below this range can mean leukopenia and higher infection risk, while counts above can indicate infection, inflammation, or other conditions affecting the bone marrow. Among the given options, the range 4,000–6,000 sits at the lower-to-mid portion of the normal interval, making it the best single representation of a normal adult WBC count within those choices. The other ranges are either below the usual lower limit or extend into higher values that aren’t as representative of a typical normal range.

White blood cell count reflects the number of immune cells circulating in the blood. In healthy adults, the typical reference range is about 4,000 to 11,000 cells per microliter, though exact cutoffs can vary a bit by laboratory. Counts well below this range can mean leukopenia and higher infection risk, while counts above can indicate infection, inflammation, or other conditions affecting the bone marrow.

Among the given options, the range 4,000–6,000 sits at the lower-to-mid portion of the normal interval, making it the best single representation of a normal adult WBC count within those choices. The other ranges are either below the usual lower limit or extend into higher values that aren’t as representative of a typical normal range.