CPT® Code 85004

The CPT® Code 85004 refers to the procedure known as an automated differential white blood cell (WBC) count. This test is essential for quantifying the number of white blood cells, which are critical components of the immune system, in a specified volume of blood. The primary purpose of conducting a WBC count is to assess the overall health of an individual and to assist healthcare providers in diagnosing various medical conditions. These conditions may include infections, allergic reactions, systemic illnesses, inflammatory processes, and hematological disorders such as leukemia. The WBC count encompasses the evaluation of five distinct types of leukocytes: neutrophils, eosinophils, basophils, monocytes, and lymphocytes. In the automated version of this test, an electronic cell counter or an image analysis instrument is utilized to accurately count each type of white blood cell separately, providing detailed insights into the patient's immune status and potential underlying health issues.