Background Risk of malnutrition can be evaluated through Controlling Nutritional (CONUT) Score based on total peripheral lymphocytes, serum albumin, and total cholesterol. Our aim was to automatically calculate CONUT in primary care when involved markers were requested and compare its performance with albumin to identify patients at risk of malnutrition. CONUT was evaluated according to patient age, and calculated the potential expenses to calculate CONUT, when serum markers were no requested, and measured. Methods We calculated CONUT when the three laboratory markers were requested, compared CONUT and albumin, considering risk of malnutrition CONUT ≥ 2, and albumin