Decreased white blood cell count.
White blood cells include neutrophils, eosinophils, basophils, lymphocytes, and monocytes. The normal white blood cell count is 4×10/L-10×10/L and may vary slightly depending on the individual testing facility and test method normal value reference range. The normal rule is that less than 4×10/L is considered leukopenia, which is a low white blood cell count.
There are many causes of leukopenia, including infectious diseases, especially viral infections, as well as hematologic diseases (such as certain types of anemia, some types of leukemia, malignant histiocytosis, etc.), physicochemical radiation, side effects of certain medications (such as certain thyroid medications, diabetes medications, antibiotics, antipyretics, etc.), autoimmune diseases, and others. All causes may cause hypocellularity.