i. <15% blasts in both the peripheral blood and bone marrow ii. <30% blasts and promyelocytes in both the peripheral blood and bone marrow iii. <20% basophils in the peripheral blood iv. Platelet count >100 × 109/L (Note: Patients will be considered to be in chronic phase if their platelet count is ≤ 100 x 109/L as a result of treatment with hydroxyurea or anagrelide provided that all of the other criteria for chronic phase CML are met).