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Hodgkin's and non-Hodgkin's lymphomas are a group of lymphoid
neoplasms involving primarily the lymph nodes and in later stages also the
bone marrow and sometimes other lympho-reticular organs like liver and
spleen. Until a lymphoma does not involve the bone marrow (which is the site of
production of blood cells), the person will have normal CBC. It is only when the lymphoid cells start replacing normal hematopoetic cells, that the normal RBC, WBC and platelets start getting depleted and ultimately, the lymphoma cells may spill over into the peripheral blood.
Hope The answer is clear. Take care.