What does a differential in a CBC provide information about?

• A. Levels of hemoglobin only
• B. Percentages of white blood cell types
• C. Red blood cell count
• D. Overall blood volume

Answer: (B)

A differential in a complete blood count (CBC) is specifically designed to provide information about the percentages of various types of white blood cells (WBCs) in the blood. This includes categorizing the white blood cells into different types, such as neutrophils, lymphocytes, monocytes, eosinophils, and basophils. By understanding the relative proportions of these cell types, healthcare providers can gain insights into a patient's immune response, identify infections, allergic reactions, and other hematological abnormalities.

The other options do not accurately reflect the purpose of a differential count. Levels of hemoglobin, red blood cell count, and overall blood volume are essential components of a CBC but are separately analyzed and reported, not part of the differential specifically designed for white blood cell analysis.