Questions: Question 14 of 15 Which of the following white blood cell (WBC) levels would indicate that a patient has leukocytosis? 1200 cells per microliter 1800 cells per microliter 5000 cells per microliter 12,000 cells per microliter

The answer is the fourth one: 12,000 cells per microliter.

Explanation for each option:

1. 1200 cells per microliter: This level is actually below the normal range for white blood cells, which is typically between 4,000 and 11,000 cells per microliter. A count this low would suggest leukopenia, not leukocytosis.

2. 1800 cells per microliter: Similar to the first option, this count is also below the normal range and would indicate leukopenia rather than leukocytosis.

3. 5000 cells per microliter: This count falls within the normal range for white blood cells, so it does not indicate leukocytosis.

4. 12,000 cells per microliter: This count is above the normal range, which is typically up to 11,000 cells per microliter. Therefore, a count of 12,000 cells per microliter indicates leukocytosis, which is a condition characterized by an elevated white blood cell count.

In summary, leukocytosis is indicated by a white blood cell count higher than the normal range, and 12,000 cells per microliter fits this criterion.