What does a differential count blood test assess?

A differential count blood test specifically evaluates the percentages of different types of leukocytes, or white blood cells, present in a sample of blood. This type of test is critical for diagnosing various conditions, including infections, allergies, and immune disorders, as each type of leukocyte plays a distinct role in the body’s immune response.

The test typically measures categories such as neutrophils, lymphocytes, monocytes, eosinophils, and basophils, providing valuable insights into a person’s health status. By understanding the proportions of these cells, healthcare providers can determine if there is an abnormality that may indicate an underlying health issue, such as an infection or inflammation.

In contrast, the other options do not relate to the purpose of a differential count blood test. Cholesterol levels pertain to lipid profiles, overall blood volume is assessed through different methods, and red blood cell counts measure a different aspect of blood, focusing on erythrocytes rather than leukocytes.