Malnutrition is a signifiant negative factor for surgical patient in the whole perioperative period. But this factor is suggestible and easy detectable even in ambulatory conditions. Since May 1, 2020, the surgeon has possibility to prescribe sipping in explicit conditions for limited period of 4 weeks. This fact strongly facilitates to affect the alternated nutritional status both preoperatively and postoperatively. The authors mention the scoring quastionnaires used for detection of malnutrition and required by health insurance companies. The conditions of prescriptions and the potential mistakes in ambulatory practice are analyzed.