Advanced Patient Assessment Practice Exam

What is the relative percentage of normal circulating eosinophils?

1. 1% to 3%

2. 0% to 5%

3. 10% to 15%

4. 5% to 10%

The correct answer is: 1% to 3%

The relative percentage of normal circulating eosinophils typically falls within the range of 1% to 3% of the total white blood cell count in a healthy individual. Eosinophils are a type of white blood cell that play a vital role in the immune response, especially in combating parasitic infections and in mediating allergic reactions. The reference range for eosinophils is established based on the normal distribution observed in the general population, and this percentage indicates their relatively minor role compared to other leukocyte types, such as neutrophils and lymphocytes. While there can be fluctuations in this percentage due to various physiological conditions or diseases, the standard range remains 1% to 3% in normal circumstances. Understanding this helps in interpreting lab results and assessing potential abnormalities associated with increased or decreased eosinophil counts, which can indicate underlying health issues such as allergies, infections, or hematological diseases.