The normal range of peripheral blood leukocyte count in adults is (3.5-9.5) × 109/L. When the leukocyte count is consistently higher than 9.5 × 109/L it is considered higher than normal and is called leukocytosis. Leukocytes are the general term for neutrophils, eosinophils, basophils, lymphocytes, and other types of cells in the blood, and there are two main causes of leukocytosis: 1. granulocytosis. Various viral infections such as chickenpox, hepatitis, and recovery from certain infectious diseases can lead to an increase in the number of lymphocytes. Certain allergic diseases, such as bronchial asthma, urticaria, and parasitic infections, are causes of eosinophilia. In addition, if a large number of abnormal forms of leukocytes are present, diseases such as malignant tumors of the hematopoietic system, such as leukemia and myeloproliferative neoplasms, need to be considered.
2. Physiological leukocytosis: After strenuous exercise or labor, during pregnancy and childbirth, or in severe cold or heat, some people may experience a physiological reaction of neutrophilia. In addition, during infancy, due to the development of the immune system, there may be a phenomenon of higher-than-normal lymphocytes in the body.
As you can see, there are many different causes of leukocytosis, and when laboratory tests indicate that the number of leukocytes is consistently higher than normal, you should seek prompt medical attention, improve systematic and formal examination and laboratory tests, and provide timely and accurate treatment after a clear diagnosis.