What is the normal range for white blood cell count (WBC) in adults?

What is the normal range for white blood cell count (WBC) in adults?

• A. 4,000-11,000/mm^3
• B. 2,000-9,000/mm^3
• C. 1,000-5,000/mm^3
• D. 5,000-15,000/mm^3

Answer: (A)

Normal white blood cell count in adults is about 4,000 to 11,000 cells per cubic millimeter of blood. This range reflects typical immune cell levels; counts below this can signal leukopenia or immune suppression, while counts above can indicate infection, inflammation, or other stressors. In practice, this helps clinicians and therapists gauge safety for activity—counts within the normal range generally support standard exercise programs, whereas values outside the range may prompt caution, further assessment, or postponement of sessions. The other options fall outside this standard reference range, either omitting the lower limit or extending too high into values that aren’t considered normal.

Normal white blood cell count in adults is about 4,000 to 11,000 cells per cubic millimeter of blood. This range reflects typical immune cell levels; counts below this can signal leukopenia or immune suppression, while counts above can indicate infection, inflammation, or other stressors. In practice, this helps clinicians and therapists gauge safety for activity—counts within the normal range generally support standard exercise programs, whereas values outside the range may prompt caution, further assessment, or postponement of sessions. The other options fall outside this standard reference range, either omitting the lower limit or extending too high into values that aren’t considered normal.