Which of the following is a normal level of leukocytes?
A. 150,000 to 400,000 per mm3
B. 4.5 to 11 thousand/mm3
C. 13.5 to 15.5 g/dL
D. 4.5 to 6 million/mm3
Answer (2)
Analyze the units provided in each option to determine which are appropriate for measuring leukocytes.
Compare the remaining options to the known normal range of leukocytes.
Identify the option that falls within the normal range, which is \boxed{4.5 to 11 thousand/mm3}.
Explanation
Problem Analysis We are asked to identify the normal level of leukocytes (white blood cells) from the given options. Leukocyte levels are typically measured in cells per cubic millimeter (mm3) or thousands per mm3. We need to select the option that falls within the normal range.
Analyzing the Options Let's analyze the options:
Option 1: 150,000 to 400,000 per mm3. This is equivalent to 150 to 400 thousand/mm3. Option 2: 4.5 to 11 thousand/mm3. This is a reasonable range for leukocytes. Option 3: 13.5 to 15.5 g/dL. This unit (grams per deciliter) is used for measuring hemoglobin, not leukocytes. Option 4: 4.5 to 6 million/mm3. This is a very high number and not within the normal range for leukocytes.
Identifying the Correct Range The normal range for leukocytes is typically between 4,500 and 11,000 per mm3, which is the same as 4.5 to 11 thousand/mm3. Therefore, the correct option is 4.5 to 11 thousand/mm3.
Final Answer The normal level of leukocytes is \boxed{4.5 to 11 thousand/mm3}.
Examples
Understanding normal leukocyte levels is crucial in diagnosing various health conditions. For example, if a patient has a suspected infection, a doctor will order a complete blood count (CBC) to check the leukocyte levels. A high leukocyte count (leukocytosis) might indicate an infection, inflammation, or certain types of cancer. Conversely, a low leukocyte count (leukopenia) could suggest immune deficiency, bone marrow problems, or side effects from medications. Monitoring these levels helps healthcare professionals make informed decisions about patient care and treatment.
The normal level of leukocytes is between 4.5 to 11 thousand/mm³, corresponding to Option B. This range is important as it indicates healthy immune function. The other options represent either incorrect units or abnormal values.
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