Test guide
Blood Differential
A blood differential test measures the amount of each type of white blood cell (WBC) that you have in your blood. This test can help diagnose or monitor an infection or condition that affects your immune system .
What it is for
A blood differential test is often part of a routine checkup . Because the five types of white blood cell do different jobs, measuring them separately can give your health care provider important information about your health. The test can also help diagnose a variety of medical conditions, such as: Source: MedlinePlus, National Library of Medicine. Medical test information is public domain. Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Limitations
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.
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