Case 1

Let’s look at another example of basophilia in CML:

Case 2

Case 3

Case 4

Case 5

Case 6

The data above are from a patient with ITP who received a 4 day course of dexamethasone 40 mg PO daily. Note that the glucocorticoid-induced leukocytosis is not associated with an increase in basophil count. In fact, some studies have shown that glucocorticoids reduce basophil counts.1

Case 7

This is a case of a leukemoid reaction in a patient with septic shock. Note that the basophil count is low, not elevated!

Case 8

This patient has idiopathic eosinophilic syndrome. Note that the basophil count does not track with the eosinophil count.


  1. How I investigate basophilia in daily practice. Int J Lab Hematol. 2020 Jun;42(3):237-245.
  2. Basophils in peripheral blood and bone marrow. A retrospective review. Am J Med 1984 Mar;76(3):509-11.
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