What does with diff mean when testing blood?

The abbreviation "with diff" when testing blood typically refers to a complete blood count (CBC) with differential. A CBC measures the levels of various components in the blood, including red blood cells, white blood cells, and platelets.

A "diff" refers to the differential count of white blood cells, further categorizing them into types such as neutrophils, lymphocytes, monocytes, eosinophils, and basophils.

By examining the differential, healthcare professionals can gain insights into potential infections, immune disorders, or other underlying health conditions based on the relative proportions and appearances of different white blood cell types.