Hello. Welcome to HCM.
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
. 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.