Corticosteroids also affect circulating white cells. Glucocorticoid treatment results in increased polymorphonuclear leukocytes in blood as a result of increased rate of entrance from marrow and a decreased rate of removal from the vascular compartment.Click to see full answer. Correspondingly, how do steroids affect white blood cells?Steroids work by decreasing inflammation and reducing the activity of the immune system. Inflammation is a process in which the body’s white blood cells and chemicals can protect against infection and foreign substances such as bacteria and viruses. Steroids reduce the production of chemicals that cause inflammation.Subsequently, question is, how long is WBC elevated after steroids? Although the degree of leukocytosis was related to the dosage administered, it did appear sooner with higher doses. Leukocytosis reached maximal values within two weeks in most cases, after which the white blood cell count decreased, albeit not to pretreatment levels. Consequently, do steroids increase white blood cell count? Summary: Glucocorticoids (e.g., dexamethasone, methylprednisolone, prednisone) are known to increase the white blood cell (WBC) count upon their initiation. The increase in WBC count is predominantly neutrophils (polymorphonuclear leukocytes; PMN).How does prednisone increase WBC?Prednisone can increase WBC as early as the first day of therapy. The important pearl is that steroid-induced leukocytosis involves an increase of polymorphonuclear white blood cells with a rise in monocytes and a decrease in eosinophils and lymphocytes.