A dynamic course of hematologic neoplasms as well as intensive chemotherapy are related with development of malnutrition symptoms in a short time. For this reason, it is necessary to perform not only screening procedure but also detailed assessment of nutritional status. The purpose of this research was the assessment of nutritional status and nutritional intervention needs in patients with hematologic neoplasms by PG-SGA score. Most of people (45%) were assigned to category: well malnourished. Next, 43% people were moderately nourished and 11% were severely malnourished. Nutritional intervention was recommended to 83% people, among who 44% indicates a critical need for intervention. The PG-SGA score allows to fully assess actual nutritional status and estimate further changes, what may help to decide on initiation of nutritional therapy.