Differential leucocytic count (DLC) test helps to detect the causes of abnormal results of white blood cell count (WBC). It helps to diagnose conditions that affect the immune system such as infection or inflammatory conditions, and leukemia. It helps to monitor ongoing treatment for abnormal WBC results. The Differential leucocytic count (DLC) test is done: • As a part of complete blood count • In case of signs and symptoms that affect the WBCs • In case to monitor ongoing treatment for WBC such as chemotherapy