The differential leucocyte count or DLC is a relative proportion of different types of WBCs (leucocytes) expressed as percentages.
The normal range of DLC is as follows (Percentage):
Neutrophils: 40 – 70%
Lymphocyte: 15 – 40%
Monocyte: 2 – 10%
Eosinophils: 1 – 6%
Basophils: 0 – 2%
The normal range of DLC per cubic millimeter
Neutrophils: 2500 – 8000/mm3
Lymphocyte: 1000 – 4000/mm3
Monocyte: 100 – 700/mm3
Eosinophils: 50 – 500/mm3
Basophils: 25 – 100/mm3
The increased or decreased number of any type of leucocyte can be an indication of an infection, allergy, or symptoms of any specific disease.
- The increased number of Neutrophils called neutrophilia that is an indication of bacterial infection like pneumonia, abscesses, meningitis, UTI, etc.
- The decreased number of Neutrophils called neutropenia that is an indication of anemia, aplastic anemia, aleukemic leukemia.
- The increased number of eosinophils called eosinophilia that is an indication of Parasitic infection, Allergic infection, Asthma, Rhinitis, Urticaria, Eczema, Dermatitis, etc.
- The increased number of basophils called basophilia that is an indication of acute allergic infection, an immediate type of hypersensitivity.
- The increased number of monocytes called monocytosis that is an indication of chronic infection like Tuberculosis (TB).
- The increased number of lymphocytes called lymphocytosis that is an indication of viral infection as well as a chronic infection.