What is the normal range for white blood cell count per cubic millimeter?

What is the normal range for white blood cell count per cubic millimeter?

• A. 1-2 thousand
• B. 3-4 thousand
• C. 4-6 thousand
• D. 5-10 thousand

Answer: (D)

White blood cell count reflects immune system status. In adults, the normal range is broadly around 4,000 to 11,000 cells per microliter (per cubic millimeter). Many standard teaching resources summarize this as about 5,000 to 10,000, which fits the typical exam reference. Choosing 5,000 to 10,000 is the best match because it sits squarely in the commonly cited normal span used in clinical practice and exams. Counts lower than this (such as 1-2k or 3-4k) suggest leukopenia, while extremely high values point toward leukocytosis. The 4-6k range is plausible but narrower and misses the upper normal end that exams often use. Context: higher counts can indicate infection, inflammation, stress, or marrow stimulation; lower counts raise concern for impaired immunity or marrow suppression.

White blood cell count reflects immune system status. In adults, the normal range is broadly around 4,000 to 11,000 cells per microliter (per cubic millimeter). Many standard teaching resources summarize this as about 5,000 to 10,000, which fits the typical exam reference.

Choosing 5,000 to 10,000 is the best match because it sits squarely in the commonly cited normal span used in clinical practice and exams. Counts lower than this (such as 1-2k or 3-4k) suggest leukopenia, while extremely high values point toward leukocytosis. The 4-6k range is plausible but narrower and misses the upper normal end that exams often use.

Context: higher counts can indicate infection, inflammation, stress, or marrow stimulation; lower counts raise concern for impaired immunity or marrow suppression.