The aim of this study was to analyse the validity and reliability of the Turkish version of the renal inpatient nutrition screening tool (Renal iNUT) for haemodialysis patients. The Renal iNUT and the malnutrition universal screening tool (MUST) were used in adult haemodialysis patients at two different centres to identify malnutrition. The subjective global assessment (SGA), regarded as the gold standard for nutritional status assessment, was utilised for comparison. Structural validity was assessed using biochemical values and anthropometric measurements, while reliability was assessed using repeated the Renal iNUT assessment. Of the 260 patients admitted, 42·3 % were malnourished (SGA score was B or C). According to the Renal iNUT, 59·6 % of the patients were at increased risk for malnutrition (score ≥ 1) and 3·8 % required referral to a dietitian (score ≥ 2). According to the MUST, 13·1 % of the patients were at increased risk for malnutrition and 8·5 % required referral to a dietitian. The Renal iNUT was found to be more sensitive in detecting increased risk of malnutrition in haemodialysis patients compared with the MUST (59·6 %