The results of treatment in 123 patients with Stages I—IV Hodgkin’s lymphoma, who had been followed up for a median of 5.7 years and treated in accordance with the CEA/ABVD protocol in 2001 to 2013, were used to analyze 1528 blood tests during first-line chemotherapy. The absolute count and percentage of lymphocytes in varying degrees of toxicity of the leukocyte lineage were indicated. Regardless of the WHO criteria of hematological toxicity graded as 0—4, the percentage of lymphocytes of less than 25 with the absolute values of more than 1.1 can be assigned to a very low or no toxicity group. The low toxicity group (25 to 30%) has absolute values of 0.9—1.0; the moderate toxicity group (30 to 40%) has absolute values of 0.7—0.8; the high toxicity group (40 to 50%) has absolute values of about 0.7; the very high toxicity group (more than 50%) has absolute values of 0.5—0.6. The given data can provide additional information along with the generally accepted hematologic toxicity criteria.